It is possible that your IAC valve is dirty, check and clean if needed. A loose/damaged/defective/idle air speed actuator/idle stop solenoid, and dirty MAF sensor connector can also cause it. If you’re vehicle is equipped with carburetor it is possible that the slow jet is clogged or the idle needs to be adjust. Is your check engine light on? Even if your check engine light is off don’t assume that you don’t have any stored trouble code, the only way to verify it is by using a scan tool.

What do you mean when air is selected? Can you elaborate this? Have your transmission fluid check if the fluid is low or contaminated; adds or change the oil if necessary.

it could be a misalignment of the gear selector, sometimes this can happen but on some vehicles i t is not adjustable. Most of the time this is an internal problem with the transmission. Check the transmission fluid level witht he car running make sure it is not low. The best is to bring this to a transmission expert, most likely needs to be rebuilt.

The major ones that i know of are broken seals. Another reasons would be mis-installation.

Here's more information
http://www.buzzle.com/articles/transmission-fluid-leak.html

If i had a penny everytimne i heard this question, and you will have people tell you to adjust the reverse gear band because it is slipping. Others will tell you to replace the valve body. Depending on how old the vehicle is and your intent to have it fixed you can either take it to a shop that will just fix what's broken, i.e. not say that it needs an entire rebuild, or you can try addingTrans oil to it.

But the worst case scenario would be a tranny rebuild, usually when ity gets busted, the reverse is the one to go out first.

You can visit http://www.autopartswarehouse.com/ if you want to search items for your vehicle. If the part you are looking for is available an image will appear along with their part number and manufacturer number, description, and its price.

Hi Kevin, your clutch assembly is possibly failing. This is serious and needs prompt repair. Visit a mechanic to diagnose this and correct the trouble. You can use a "Find a Shop" feature of AutoMD for nearby shops.

It's most likely that the stoplamp switch and the cruise brake release switch are out of adjustment. If they do not engage within a certain time/distance when you hit the brake pedal, it will set a fault code, disabling the cruise for some time.

Did you already check you transmission fluid level? When did the last time that you’ve replaced your transmission fluid? Try to diagnose your vehicle with a scan tool to check if there is a stored trouble code in your vehicle.

Did you already check you transmission fluid level? When did the last time that you’ve replaced your transmission fluid? Try to diagnose your vehicle with a scan tool to check if there is a stored trouble code in your vehicle.

Did also get another opinion (mechanics)? Because ECU/PCM are very expensive you have to be certain before you decide to replace it.