1994 GMC Truck Chugging

1994 GMC TRUCK
32,000 MILES • 6 CYL • 2WD • MANUAL
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BEVELD
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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
Jul 9, 2010 at 9:02 PM
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RASMATAZ
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  • 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
Jul 9, 2010 at 9:14 PM
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RASMATAZ
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  • 75,992 POSTS
Inspect and test the throttle position sensor
Jul 9, 2010 at 9:50 PM
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