Check the hose clips for tightness and examine the trunking for any cracks or splits and as a consequence every the vacuum system, the small bore pipes and fittings for cracks and missing parts. The best artifice to locate a leak is to have the engine direction and hot and subsequently spray can lighter gas /propane or brake cleaner around each joint in turn. If the engine rev s happening you ve found your leak.
Thanks for your response. I just checked what you mentioned, that I hadn't already checked, except fuel pressure.Let me say you a little more not quite the trouble history. It currently has a master tech endorsed idle expose govern valve and tps installed. without distressing anything, the last (used) ecu and my original, would direct in the car without this symptom.
later than I begin the car, the engine surges up amid 1200 and 2000 rpm support and forth. I misused the IAC and the TPS similar to no amend in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to become accustomed the idle zeal screw to humiliate the rpm and it would preserve for a while. Now, the engine is permanently surging to the reduction where I cannot drive it for distress signal of broken to the drive train. Any experienced solution?