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You need to fix this issue before you boost the car, the missing is very dangerous for your engine.
A vacuum leak or a bad/mal-adjusted TPS could cause this.
The rattling noise is a puzzler (you never had this engine apart, did you)?
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1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers)
1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)
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