First step - have the check engine light or stored fault codes scanned - for free - at any local auto parts store; Advance Auto, Auto Zone, NAPA. Then, post a reply as 'add answer' for more assistance.

Possible Causes of Engine Hesitation or Stumble:

Dirty fuel injectors (cleaning the injectors often fixes this)
Dirty air filter (change filter)
Dirty / clogged fuel filter (change filter)
Bad MAP (manifold absolute pressure) sensor
Bad TPS (throttle position) sensor
Bad or dirty MAF (mass airflow) sensor
Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
Bad gasoline (fuel contaminated with water or too much alcohol)

Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include:

Dirty or worn spark plugs
Bad plug wires
Weak ignition coil
Wet plug wires

I am having the same problem and have replaced the fuel pump and filter, coils and plugs and plug wires, put a bottle of sea foam to a half tank of gas so it would be strong. I have been told now by auto zone with a test that it is the intake air temp sensor. The test came back with this part is bad but it can be the cadillac converter too !! Guess the sensor is cheapest so I am starting there. Go to auto zone and have them check codes.

Unless the vehicle or system involved is under warranty, yes, you pay for repairs.

Technical Service Bulletins, or TSBs, are recommended procedures for repairing vehicles. Not to be confused with recalls, a TSB is issued by a vehicle manufacturer when there are several occurrences of an unanticipated problem. TSBs can range from vehicle-specific to covering entire product lines and break down the specified repair into a step-by-step process.

While sometimes written by engineers employed by OEM's, the majority of TSBs are authored by the first automotive technician to come up with a repair procedure. Because certain problems may have more than one cause or there are sometimes more than one way to fix a problem, it's somewhat common for there to be more than one TSB for the same problem.
One major difference between a recall and a TSB in the automotive industry is that a recall usually evolves out of safety issues at the behest of an organization like the National Highway Traffic Safety Administration (NHTSA). The ensuing recall maintenance/repair work is usually done at no charge to the car owner, regardless of the car's warranty status. Dealers are usually under no mandate to call in cars for which there are TSBs to do the related repairs. Nor is there an obligation to do the TSB repairs for free or at reduced charges to the owner.

You have a bad ignition switch. the probability here is greater than 90%. Trailblazer is well known for bad ignition switches. This is a pattern failure.

No problem, it OK to use this type of oil, if it wasn't used from the start.

No concern, this is a myth about if you switch from one to the other it does bad stuff. No worry.Synthetic oil is better.

If you are removing them with a totally cold engine, try bringing engine up to full temperature and then try removing plugs. Try penetrating oil, specifically "Kroil" which is a magical aerosol lubricant that Superman brought back from planet Krypton. AutoZone sells it, only place or else order online from maker.

See this 2010 Chevrolet Equinox - Consumer Reviews

http://www.edmunds.com/.../...umer-reviews.html

You will need a power steering pump pulley puller. After the pulley is removed the pump is bolted to the bracket with the bolts that you can now see. There is another bolt that goes from a bracket at the rear of the pump to the block. I will assume that you know how to remove the belt and fan shroud to give yourself room to work at the pump. The same puller set can also reinstall the pulley to the new pump. I recc you buy a pump that comes already assembled it the reservoir ass opposed to the pump that comes a little cheaper but you have to transfer the reservoir from the old pump to the new pump.

This vehicle is still under the 3 years or 36,000 miles warranty bumper to bumper. Call Chevrolet Dealer to schedule a warranty repair.

Check the harness to the o2 sensor, it should be three wires. One will be ground, one will be signal (0.5 to 5v) and one will be heater (12v). If you get less than the perscribed voltage with the vehichle on and running with a good ground wire (

do you have a leakly exhust if you do that is your problem make sure there are no leaksin the exhust

See this 2001 CHEVROLET IMPALA 3.8L SFI OHV 6CYL REPAIR GUIDE / DIAGNOSTICS / DIAGNOSTIC TROUBLE CODES / 3.8L V6 VIN 1 AUTO 1

http://www.autozone.com/.../...rGuideContent.jsp

IE... Trouble Code: P0101


MAF Sensor Signal Range/Performance

Possible Causes:



Base engine vacuum leak, PCV valve leaking or stuck open
Engine oil dipstick missing or not fully seated
MAF sensor signal or ground circuit fault or sensor has failed
PCM has failed

auto zone will also give you the code refferance just takes a little time to find it

You can try these websites for the OBD codes definitions; www.actron.com, www.obd-codes.com, www.dtc-search.com - to list only a few.
The information provided on these websites may not be a diganosis as much as the definition of the specific or list of fault codes.

Several possibilities; faulty wiring / connection common to both tail lights, poor quality ground, faulty stop light switch, faulty light switch.

drivers side behind fuel tank

There is a vapor canister purge valve located on the intake manifold, on the firewall behind the engine, or at the fuel tank. Try the many on-line auto parts sources, such as; www.autopartswarehouse.com or www.rockauto.com for the replacement parts. For example, they (RockAuto) list the vapor canister purge valve from around $19.00 for your vehicle.