Check the hose clips for tightness and examine the trunking for any cracks or splits and next every the vacuum system, the small bore pipes and fittings for cracks and missing parts. The best way to locate a leak is to have the engine organization and warm and later spray can lighter gas /propane or brake cleaner going on for each joint in turn. If the engine rev s in the works you ve found your leak.
I started the car up this morning, it starts stirring and runs at 1750 and within a minute or in view of that climbs on top of 2500.. It is organization serene though, just pretension difficult than it should be. I next checked the throttle screw plate/return screw, intentionally turned it out and nothing changed. put it encourage to exactly where it was. No vacuum leak sounds and every contacts verified. I environment good about them as I've been in there a bunch of times..
with I start the car, the engine surges taking place amongst 1200 and 2000 rpm assist and forth. I tainted the IAC and the TPS considering 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 promptness screw to subjugate the rpm and it would preserve for a while. Now, the engine is continually surging to the point where I cannot steer it for distress signal of damage to the drive train. Any experienced solution?