Check the hose clips for tightness and inspect the trunking for any cracks or splits and then every the vacuum system, the small bore pipes and fittings for cracks and missing parts. The best exaggeration to locate a leak is to have the engine running and hot and later spray can lighter gas /propane or brake cleaner with reference to each joint in turn. If the engine rev s in the works you ve found your leak.
Might afterward be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can complete a quick aberration find if you unplug the meter and govern the engine without it. if the engine condition is the thesame after that chances are the meter or the association to it is faulty. Its in addition to worth cleaning the MAF sensor wires, as they can acquire coated as soon as dirt greater than time which next offsets the reading. Use some right to use cleaner or brake cleaner to vaporizer onto the wires to sever the dirt on no account touch the wires bearing in mind anything as they are totally fragile
in imitation of I start the car, the engine surges taking place with 1200 and 2000 rpm assist and forth. I tainted the IAC and the TPS taking into consideration no alter in symptoms. I have noticed that several Lexus SC's have this same issue. Prior to this I would have to get used to the idle speed screw to degrade the rpm and it would preserve for a while. Now, the engine is continually surging to the lessening where I cannot steer it for terror of broken to the steer train. Any experienced solution?