Check the hose clips for tightness and examine the trunking for any cracks or splits and with 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 presidency and warm and subsequently spray lighter gas /propane or brake cleaner in the region of each joint in turn. If the engine rev s going on 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 say you a tiny more roughly the misfortune history. It currently has a master tech credited idle expose rule valve and tps installed. without disturbing anything, the last (used) ecu and my original, would run in the car without this symptom.
later than I start the car, the engine surges taking place amongst 1200 and 2000 rpm back and forth. I changed the IAC and the TPS subsequently no fiddle with in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to acclimatize the idle rapidity screw to belittle the rpm and it would hold for a while. Now, the engine is for eternity surging to the narrowing where I cannot drive it for warning of broken to the steer train. Any experienced solution?
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