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1994 GMC Truck Chugging

Tiny
BEVELD
  • MEMBER
  • 1994 GMC TRUCK
  • 6 CYL
  • 2WD
  • MANUAL
  • 32,000 MILES
I also have a PU that had the same problems as the Sable. It all started with bad gas. Anyway, I also changed the plugs in my truck, today, because it was coughing and backfiring, and now, I can't get up any speed. It sounds like a machine gun and won't get over 40 mph. It's a 5 speed and I didn't have THIS problem before changing the plugs. Did I do something wrong?

Beveld
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Friday, July 9th, 2010 AT 9:02 PM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Possibilities: Inspect and test all the following listed below:

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Crankshaft position 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.

Note:If it doesn't apply disregard
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Friday, July 9th, 2010 AT 9:14 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Inspect and test the throttle position sensor
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Friday, July 9th, 2010 AT 9:50 PM

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