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a 242/248 cam can certainly cause a drop in vacuum. I think the rest is tuning related but with a cam that size you are going to have to deal with some low RPM surging and it is going to idle rough.
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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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