I have (Mods in signature) and if I have the A/C on In drive at a stop Idling at 500 rpm at first it would just start rumbling and shaking from under the car, then today i was backing out of a parking spot and my car luged a little bit and then i was at another light and my car started fluctuating rpm's it would act as if the pcv valve was sticking or something but i really dont know much about the pcv, but it would bog down below 500 to about 200 then back up to 6-700 rpm's repeating this until i took off or gave a little gas, it doesnt do it all the time but today was the first. If anyone can tell me what might have caused this please let me know THANKS!

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99 Z28RS
SLP LoudMouth
SLP Air Temp Module
MTI Carbon Fiber Air Lid/K&N
EGR Mod,FRA Mod

 

My first thought is a vacumn leak somewhere.

realize of course that it's almost 2:00 AM and I'm not exactly firing on all cylinders.

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2001 TransAm WS6, M6 3.42
HPP, TBB, 160* t-stat, MTI Lid, Holley PowerShot, Flowmaster 80, Port/Polish MAF

2001 Z28
-- R.I.P. - 06/25/02

 

you know, my M6 was acting up last weekend. It would damn near stall when I would turn on my A/C. It would bogg down so low, that I could hear then engine grinding (you know from a very low rpm). And it hasn't acted up at all this week. I have been running the A/C all week, and nothing. My guess it that I had some bad gas or something.

 

ThaTS Exatley what my car was doing and it didnt do for the rest of the day, but Ill keep watching.

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99 Z28RS
SLP LoudMouth
SLP Air Temp Module
MTI Carbon Fiber Air Lid/K&N
EGR Mod,FRA Mod

 

I agree with the vaccum statement.Maybe the EGR valve?My EGR went in my old V6 and that's exactly what it did,only it did it all the time.Good luck.
Kevin

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1998 Black Z28 A4
-------1/8-------
8.584 @ 83.64 MPH
Taylor 10.4mm wires,!EGR,!FRA,SLP Lid,MAF Ends,IAT Tricker,TB Bypass,Manual Fan Switch,and Dynomax Cat-back

BMR STB and Sub-frame Connectors

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