I know theres other threads that talk mabout high idle but ive tried everthing. I have a 1993 camaro 3.4. could the hose from the evap canister cause a high idle I hear a hissing sound coming from the drivers side arround the exaahust manifold and its idleing between 2000 and 3000 rpm. i got it from a guy on here he told me it was the iac and i saw he replaced it already along with the tps and temp sensors and water pump the guy i got it from is gville4life maby someone remembers him. I tried to get ahold of him but he wont answer his phone he got my blazer as a trade. i couldnt see anything at night when we traded or i would have relized that he already changed the sensors. what could it be