Check the hose clips for tightness and inspect 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 quirk to locate a leak is to have the engine processing and warm and subsequently spray lighter gas /propane or brake cleaner not far off from each joint in turn. If the engine rev s up 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 tiny more not quite the suffering history. It currently has a master tech official idle freshen govern valve and tps installed. without upsetting anything, the last (used) ecu and my original, would manage in the car without this symptom.
in imitation of I start the car, the engine surges taking place with 1200 and 2000 rpm support and forth. I tainted the IAC and the TPS as soon as no regulate in symptoms. I have noticed that several Lexus SC's have this same issue. Prior to this I would have to accustom yourself the idle keenness screw to degrade the rpm and it would keep for a while. Now, the engine is forever surging to the lessening where I cannot drive it for anxiety of broken to the steer train. Any experienced solution?