Check the hose clips for tightness and inspect the trunking for any cracks or splits and after that every the vacuum system, the little bore pipes and fittings for cracks and missing parts. The best quirk to find a leak is to have the engine supervision and warm and subsequently spray lighter gas /propane or brake cleaner something like each joint in turn. If the engine rev s in the works 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 tell you a little more roughly the difficulty history. It currently has a master tech attributed idle air govern valve and tps installed. without moving anything, the last (used) ecu and my original, would govern in the car without this symptom.
next I begin the car, the engine surges occurring in the company of 1200 and 2000 rpm back up and forth. I misrepresented the IAC and the TPS considering no alter in symptoms. I have noticed that several Lexus SC’s have this similar issue. Prior to this I would have to accustom yourself the idle keenness screw to demean the rpm and it would support for a while. Now, the engine is constantly surging to the lessening where I cannot drive it for panic of broken to the drive train. Any experienced solution?
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