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1991 GMC Sierra

Tiny
HUNTERMAN2010
  • MEMBER
  • 1991 GMC SIERRA
  • V8
  • 4WD
  • AUTOMATIC
  • 192,000 MILES
Okay the motor and tranny have 30000 on them but when I start it up it starts up hard. I just put a new starter in it last winter. I think it might be the fuel pump. But also when it is idling it skips a beat when it idles. Also when I am driving down the road and or if I wanna lay it to the rug to feel all the power it doesn't get up and go. And it doesnt feel like it is getting all of the power it has from the 350 I have in it?
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Thursday, September 16th, 2010 AT 10:33 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.
False air leakage.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

If it doesn't apply disregard it and keep testing
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Friday, September 17th, 2010 AT 2:57 AM

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