04-15-2008, 08:46 PM
It's an 02 Z28 motor with the stock Z28 fuel system (tank, pumps, etc all swapped over). I had what was suppose to be the rear O2, VATS and a couple other things tuned out but I know the fans were also set lower despite not asking for it so I'm not sure what else was really done to the tune. It's also a T56. So it idles at about 950 RPM which seems very high to me. Does not cause any real problem just seems high. Thought it might be the less restrictive intake allowing more past the throttle body (basically take an orifice out from the intake so the total restriction is lower and thus the flow is higher for the same vacuum) since I only have a K&N on the MAF. So I backed the throttle body idle screw out and it did not change anything just make it stick closed. Sprayed some either around the engine with it idling to check for leaks and could not find any. So any ideas where else to look? Since it's controlled by airflow I dont think if they changed the tune would cause elevated idle would it?