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so last week try to put an ls throttle bodie on and tune it but ran like shit so put old stock one back on and now car gets shitty gas milage and i changed fuel filter last night and still gettin bad gas milage car when idles revs 1,200 rpms and drops back down to a 1,000 if anyone has an idea what the problem is let me know thanx
Vac / intake leak? Check the seals on the throttle body, make sure the vac lines all got hooked back up to it... good luck?
Does sound like a vac problem, but depending on what ECU you are using, you can always try disconnecting the battery and leaving it off for awhile to reset. My first inclination would be a vac problem.
thanx people it was the map sensor missing gasket!