The fact that this problem is intermittent is making it very difficult to diagnose. Iv read many problems very similar to this one, but with no solution for me as of yet. 2001... non-supercharged 3.8... 97000 miles
Changed Maf sensor to bwd sensor... Car would rev up and down at idle and stumble at 20 mph and kinda hesitate from a stop... I returned sensor.
A new Cardone sensor was purchased the idle got better ... but same thing happens it will also stumble at 20 mph, slightly hesitate from a stop.
It definitely stumbles harder with a quick throttle position change (tapping the gas pedal)
I know some people on this site have gotten better reviews with cleaning throttle. I took the throttle body off and cleaned it.
Everything back together.... Car does the same thing, I unplugged the maf and it ran fine, I don't see any kinked or melted wires.
I think the only thing to do now if to maybe try and get an ac delco maf sensor.....no maf sensor codes
