Unfortunately, a rough idle can be caused by lots of things. If you have a vacuum leak, chances are it will turn into a boost leak whenever you're boosting, which will cause the car to run rich and decrease performance. You could also have incorrect cam timing, which will make it idle rough and REALLY decrease performance. You could also have a bad ECU, or a bad MAF. You could also have a mis-fire.. Start with the easy stuff and work your way through the car.
_________________ 91 GSX - 511fwhp and 352 lb/ft 25psi 110 octane, 7.68 @ 95.9mph 1/8th 21psi 91 octane, 11.93 @ 112.9mph, 117.7mph best trap speed, 20psi 91 octane
98 Volvo S70 T5 - DD
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