john09707 7/7/2012

1998 Mercury Mystique GS 4Cyl2.0L - Engine

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Car stalling after start up

I replaced the mass air flow and now my car stalls right after I turn in on. A friend accidentally made the battery spark and blew some sensors. Repalced throttle position, mass air flow, tranmission speed that's for now but this started after changing mass air flow sensor could it be the relay went bad or did I buy a dud well have tested just want to know someones opion

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  Jimm 7/7/2012

  Possible Causes of Engine Hesitation or Stumble:
  
  Dirty fuel injectors (cleaning the injectors often fixes this).
  Dirty / clogged air filter element (change the air 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
  

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