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I think he has an LS1, MAP sensor is tough to get to. Could be a vacuum leak, most common ones are in the T/B area. Does it happen all the time? Just when it is hot? Just on start-up? Also your car will idle very poorly with a vacuum leak. mine would stall alot cold when I had a leak. Is your RPM surge at idle or when you are driving? Do you have a stick or an auto?
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-Nick
9/11/01- Never Forget
2002 Pontiac Trans-Am WS6 # 206
Chasing 10's
469RWH/437RWTQ
11.05 @ 123
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