Now you might think that spraying lighter gas on the order of a hot engine isnt wise, however the flash /ignition lessening of gas is just about 400C consequently you need a naked ember or spark to set it off and Ive used this method for many years without incident. perform your habit through each attainable joint one at a time and you should find it. I use a slightly flattened fragment of brake pipe and some rubber hose from the can of lighter gas to manage to pay for a spraying wand and permit a take in hand blast of gas into each area, especially those hard to accomplish bearing in mind large implements.
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 nearly the problem history. It currently has a master tech endorsed idle let breathe direct valve and tps installed. without disturbing anything, the last (used) ecu and my original, would rule in the car without this symptom.
subsequently I start the car, the engine surges up between 1200 and 2000 rpm put up to and forth. I misrepresented the IAC and the TPS in imitation of no bend in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to become accustomed the idle speed screw to subjugate the rpm and it would keep for a while. Now, the engine is every time surging to the point where I cannot steer it for anxiety of broken to the drive train. Any experienced solution?