Check the hose clips for tightness and examine 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 pretentiousness to locate a leak is to have the engine doling out and hot and next spray can lighter gas /propane or brake cleaner roughly speaking each joint in turn. If the engine rev s stirring you ve found your leak.
I started the car in the works this morning, it starts in the works and runs at 1750 and within a minute or fittingly climbs on top of 2500.. It is organization mild though, just showing off later than it should be. I next checked the throttle screw plate/return screw, on purpose turned it out and nothing changed. put it encourage to exactly where it was. No vacuum leak sounds and every contacts verified. I quality fine nearly them as I've been in there a bunch of times..
considering I begin the car, the engine surges in the works with 1200 and 2000 rpm support and forth. I changed the IAC and the TPS later no alter in symptoms. I have noticed that several Lexus SC's have this same issue. Prior to this I would have to adapt the idle zeal screw to demean the rpm and it would sustain for a while. Now, the engine is each time surging to the tapering off where I cannot drive it for alarm clock of damage to the drive train. Any experienced solution?