Check the hose clips for tightness and examine the trunking for any cracks or splits and along with all the vacuum system, the little bore pipes and fittings for cracks and missing parts. The best way to locate a leak is to have the engine meting out and hot and next spray lighter gas /propane or brake cleaner something like each joint in turn. If the engine rev s occurring you ve found your leak.
Its after that worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a sick pump will all outcome in insufficient fuel instinctive delivered to the engine. Might as a consequence be worth cleaning out the idle eagerness run motor / valve as these acquire clogged happening considering carbon and some brake cleaner washed through helps release things off.
as soon as I begin the car, the engine surges stirring amongst 1200 and 2000 rpm put up to and forth. I misused the IAC and the TPS behind no regulate in symptoms. I have noticed that several Lexus SC's have this thesame issue. Prior to this I would have to acclimatize the idle promptness screw to humiliate the rpm and it would support for a while. Now, the engine is for all time surging to the tapering off where I cannot drive it for distress of broken to the drive train. Any experienced solution?