Car hesitating

LLCORTEZ

MEMBER
1997 ISUZU TROOPER
6 CYL
4WD
AUTOMATIC
85,000 MILES

My car is a 97 izuzu trooper, it has started to hesitate when excelerating at 40 miles per hour after driving about 20 or 22miles, Once the engine cooled, it ran ok, then it would hesitate again I was told to have the airflow sensor replaced which I did and add Lucas to the gas tank. This helped some, I can longer before is starts hesitating again. I was told it was not the fuel pump beacuse the car never stalled out. What else could be the problem. Any advise you can give me would be wonderful. Thank You

Tuesday, March 29th, 2011 AT 7:01 PM

1 Reply

RASMATAZ

MECHANIC
75,992 POSTS

Could be caused by one of the following below

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Crankshaft position sensor
Knock sensor
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note:If it doesn't apply disregard it and keep testing.

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Tuesday, March 29th, 2011 AT 7:33 PM