Check the hose clips for tightness and inspect the trunking for any cracks or splits and moreover every the vacuum system, the small bore pipes and fittings for cracks and missing parts. The best quirk to find a leak is to have the engine government and warm and after that spray lighter gas /propane or brake cleaner a propos each joint in turn. If the engine rev s taking place you ve found your leak.
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Thanks for your response. I just checked what you mentioned, that I hadn't already checked, except fuel pressure.Let me tell you a tiny more just about the misfortune history. It currently has a master tech ascribed idle let breathe manage valve and tps installed. without touching anything, the last (used) ecu and my original, would rule in the car without this symptom.
past I begin the car, the engine surges stirring together with 1200 and 2000 rpm put up to and forth. I changed the IAC and the TPS subsequently no change in symptoms. I have noticed that several Lexus SC's have this same issue. Prior to this I would have to become accustomed the idle readiness screw to subjugate the rpm and it would maintain for a while. Now, the engine is forever surging to the point where I cannot drive it for fright of damage to the drive train. Any experienced solution?
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