2003 Chevy Cavalier Stalling and hesitation

CHRISBISDORF

MEMBER
2003 CHEVROLET CAVALIER
4 CYL
2WD
AUTOMATIC
130,000 MILES

My car has been stalling out and hesitating while I drive. The hesitation feels like a miss while I'm driving. It can happen at 25mph or 50mph. It starts missing and will continue doing it for long periods of time. Just recently it had begun stalling out. I will come to a stop, give it gas to start up again and it will stall. It is an intermident problem so no one can diagnose it. Any ideas?

Tuesday, August 25th, 2009 AT 11:57 AM

1 Reply

RASMATAZ

MECHANIC
75,992 POSTS

Oxygen sensor
Catalytic converter
Dirty fuel injectors (cleaning the injectors often fixes this).
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

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Tuesday, August 25th, 2009 AT 12:00 PM