GMC Hesitating

2001 GMC SONOMA
145,000 MILES • 6 CYL • 4WD • AUTOMATIC
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CHBARBER
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  • 3 POSTS
2001 GMC Sonoma 4.3L V6- It started hesitating at around 45-55 mph today. Now it hesitates when I am getting up to speed from a start and nearly stalls at some stop lights. When I take off hard it does fine. New Fuel Filter, plugs, wires. O2 sensor error on OBII.
Mar 23, 2011 at 12:54 AM
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RASMATAZ
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  • 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.

Note:If it doesn't apply disregard it and keep testin
Mar 23, 2011 at 1:03 AM
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CHBARBER
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I am going to run seafoam through the PCV valve one day this week. I am also going to run a can through the gas to see if it will clean up some of the parts. Any clue on how to narrow this down?
Mar 23, 2011 at 1:17 AM
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