Mechanics

ENGINE

2004 GMC Envoy • 6 cylinder 2WD Automatic • 140,000 miles

2004 GMC Envoy engine jumping like its about to cut off like it's losesing presure
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Manthonyb
February 4, 2011.



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.

Rasmataz
Mar 28, 2011.