Check the hose clips for tightness and examine the trunking for any cracks or splits and in addition to all the vacuum system, the little bore pipes and fittings for cracks and missing parts. The best mannerism to find a leak is to have the engine management and warm and later vaporizer lighter gas /propane or brake cleaner going on for each joint in turn. If the engine rev s going on you ve found your leak.
Might as a consequence be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can accomplish a fast deviation locate if you unplug the meter and govern the engine without it. if the engine condition is the same after that chances are the meter or the association to it is faulty. Its after that worth cleaning the MAF sensor wires, as they can get coated when dirt greater than epoch which subsequently offsets the reading. Use some gate cleaner or brake cleaner to vaporizer onto the wires to remove the dirt on no account lie alongside the wires afterward all as they are categorically fragile
in imitation of I begin the car, the engine surges stirring in the company of 1200 and 2000 rpm assist and forth. I changed the IAC and the TPS when no regulate in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to accustom yourself the idle quickness screw to humiliate the rpm and it would sustain for a while. Now, the engine is forever surging to the narrowing where I cannot steer it for radio alarm of damage to the drive train. Any experienced solution?