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Old 02-13-2005, 03:29 PM   #1
KingDiamond
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Stumbles on acceleration?

My car idles smoothly and there no lights on, But once it gets warm it stumbles on acceleration, but once i get speed up it runs fine again. No check engine light comes on ever.

This is stuff I've replaced so far:
Fuel Pump
Fuel Filter
MAP sensor
EGR Valve
Barametric Pressure Sensor

And it still does it! DO you guys have any ideas?
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Old 02-13-2005, 03:48 PM   #2
jeffcoslacker
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Re: Stumbles on acceleration?

Throttle position sensor? Check with ohmmeter for drop outs in reading as you sweep the throttle open and closed. Might have a dead spot. Seems like it would do it when cold, too, but maybe running rich cold mixture overcomes the glitch.
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Old 02-13-2005, 07:57 PM   #3
mkobler
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Re: Stumbles on acceleration?

Dear KingDiamond.
I had the same trouble with my 1999 Lumina. I brought the car to the dealer and had my EGR valve cleaned. Additionally, the dealer put a can of "Sea Foam" in the gas tank and told me to put a can of this stuff at every oil change. This worked well considering the numerous problems that I have had with this car; some 38 repairs in the first 18 months which includes a new 3.1 engine that Chevy put in under waranty.
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