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I have a 1996 deville that idle highs at around 2200-3000 RPM when sitting park and when it is in drive it can reach about 30 mph without me pressing the gas. I've changed the following parts and still doing the same thing. vehicle does not misfire or idle rough and starts up immediately. I am stumped. -changed TPS -changed MAF SENSOR -changed IDLE AIR CONTROL SENSOR -changed INTAKE MANIFOLD GASKETS -changed EVAP PURGE SOLENOID