2001 GMC Sonoma • 6 cylinder 4WD Automatic • 145,000 miles

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.
March 23, 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 testin

Mar 23, 2011.
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.