Check the hose clips for tightness and examine the trunking for any cracks or splits and with all the vacuum system, the small bore pipes and fittings for cracks and missing parts. The best quirk to locate a leak is to have the engine organization and hot and then vaporizer lighter gas /propane or brake cleaner nearly each joint in turn. If the engine rev s happening you ve found your leak.
Might plus be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can get a fast aberration locate if you unplug the meter and direct the engine without it. if the engine condition is the same subsequently chances are the meter or the membership to it is faulty. Its as a consequence worth cleaning the MAF sensor wires, as they can acquire coated subsequently dirt exceeding grow old which later offsets the reading. Use some gain access to cleaner or brake cleaner to spray can onto the wires to separate the dirt upon no account touch the wires like all as they are entirely fragile
gone I begin the car, the engine surges happening in the midst of 1200 and 2000 rpm back and forth. I misused the IAC and the TPS in imitation of no amend in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to familiarize the idle quickness screw to degrade the rpm and it would retain for a while. Now, the engine is for ever and a day surging to the tapering off where I cannot drive it for unease of damage to the drive train. Any experienced solution?