Check the hose clips for tightness and inspect the trunking for any cracks or splits and as well as all the vacuum system, the little bore pipes and fittings for cracks and missing parts. The best exaggeration to find a leak is to have the engine dealing out and warm and next spray can lighter gas /propane or brake cleaner on each joint in turn. If the engine rev s up you ve found your leak.
I did re-check them tho. The master tech did extensive tests on the expose flow meter and said it was good. as soon as I unplug it and run the motor, the car runs sharp and at 850ish. I can single-handedly guess that my supplementary rebuilt ecu has an issue, or the tps needs to be re-adjusted, or somehow my maf has died in the midst of all this. I don't think the tps has that much control in the exchange of rpm though? I think it unaccompanied adjusts it all but 1k..
later I begin the car, the engine surges going on between 1200 and 2000 rpm back and forth. I untouched the IAC and the TPS with no alter in symptoms. I have noticed that several Lexus SC's have this same issue. Prior to this I would have to get used to the idle quickness screw to subjugate the rpm and it would hold for a while. Now, the engine is continuously surging to the point where I cannot drive it for radio alarm of damage to the steer train. Any experienced solution?