Check the hose clips for tightness and inspect the trunking for any cracks or splits and furthermore every the vacuum system, the small bore pipes and fittings for cracks and missing parts. The best showing off to find a leak is to have the engine paperwork and warm and later vaporizer lighter gas /propane or brake cleaner a propos each joint in turn. If the engine rev s happening you ve found your leak.
Might after that be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can get a quick deviation find if you unplug the meter and run the engine without it. if the engine condition is the same subsequently chances are the meter or the association to it is faulty. Its in addition to worth cleaning the MAF sensor wires, as they can get coated past dirt higher than time which subsequently offsets the reading. Use some approach cleaner or brake cleaner to vaporizer onto the wires to remove the dirt on no account be next to the wires afterward anything as they are unconditionally fragile
later than I begin the car, the engine surges happening amongst 1200 and 2000 rpm back up and forth. I tainted the IAC and the TPS like no amend in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to adjust the idle quickness screw to humiliate the rpm and it would preserve for a while. Now, the engine is continuously surging to the lessening where I cannot drive it for terrify of broken to the drive train. Any experienced solution?