Check the hose clips for tightness and examine the trunking for any cracks or splits and after that every the vacuum system, the small bore pipes and fittings for cracks and missing parts. The best pretentiousness to find a leak is to have the engine doling out and warm and after that spray can lighter gas /propane or brake cleaner on the order of each joint in turn. If the engine rev s in the works you ve found your leak.
I started the car occurring this morning, it starts stirring and runs at 1750 and within a minute or in view of that climbs higher than 2500.. It is executive mild though, just pretentiousness well along than it should be. I after that checked the throttle screw plate/return screw, carefully turned it out and nothing changed. put it support to exactly where it was. No vacuum leak sounds and every friends verified. I setting fine practically them as I've been in there a bunch of times..
in the manner of I begin the car, the engine surges occurring surrounded by 1200 and 2000 rpm incite and forth. I distorted the IAC and the TPS taking into consideration no modify in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to get used to the idle keenness screw to humiliate the rpm and it would preserve for a while. Now, the engine is every time surging to the point where I cannot drive it for terrify of damage to the steer train. Any experienced solution?