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When I turn the AC its like the ECU isn't compensating at all. The RPM's drop by 5-600. I have to keep the idle at around 1000-1100 just so if I turn the ECU on the car won't have a problem staying running. Any ideas? I have a rebuilt ecu from Foriegn Car Connection or something like that and I've never had any problems with it. Actually I had the same problem with my old ecu before swapping so its got me stumped. I've checked the ISC and it checks ok and I set the idle correctly so any help would be appreciated. Thanks.

Kris Vadnais
91 TSi AWD
 

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I would check the A/C belt, sounds like it could be a little too tight. If its not that, I have no idea.

Josh
 
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