1989 Chevy Corsica hesitation

RCMSFATBOTTOMGIRL

MEMBER
1989 CHEVROLET CORSICA
6 CYL
FWD
AUTOMATIC
143,000 MILES

When I first crank my car it runs rough like not getting enough gas I pump the gas but it only acts like it gets the gas when I let off the gas pedal and before I can drive the car I have to wait til it starts running smooth before I can go then when the car stops and I go to take off it hesitates then takes off what could be causing this we have replaced the fuel regulator fuel filter coil pack that was going bad there is also a noise that sounds like air leaking while driving down the road please help I really need to get this fixed.I have 2 young boys that are both sick and we absloutely need this car

Monday, October 13th, 2008 AT 2:36 PM

1 Reply

RASMATAZ

MECHANIC
75,992 POSTS

Possible Causes of Engine Hesitation/Poor acceleration

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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Thursday, October 16th, 2008 AT 6:21 AM