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Check the hose clips for tightness and inspect the trunking for any cracks or splits and along with all the vacuum system, the small bore pipes and fittings for cracks and missing parts. The best habit to find a leak is to have the engine admin and warm and next spray lighter gas /propane or brake cleaner around 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 say you a little more about the suffering history. It currently has a master tech recognized idle air govern valve and tps installed. without disturbing anything, the last (used) ecu and my original, would govern in the car without this symptom.

when I begin the car, the engine surges occurring amongst 1200 and 2000 rpm incite and forth. I untouched the IAC and the TPS like no fiddle with in symptoms. I have noticed that several Lexus SC's have this thesame issue. Prior to this I would have to adjust the idle quickness screw to subjugate the rpm and it would preserve for a while. Now, the engine is each time surging to the dwindling where I cannot drive it for frighten of damage to the steer train. Any experienced solution?