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Engine is hesitating unless I accelerate hard

Tiny
TERPFAN
  • MEMBER
  • 1999 GMC SIERRA
  • 150,000 MILES
I have 1999 gmc sierra 4x4 5.3v8 regular cab When I am driving at 40-50miles an hour and have to slow down to say 30 and then speed back up it hesitates and jumps unless I mash the gas then it moves i've replaced spark plugs, air filter, fuel filter and transmisssion filter
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Tuesday, October 25th, 2011 AT 5:31 PM

1 Reply

Tiny
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.
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Wednesday, October 26th, 2011 AT 1:01 AM

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