Check the hose clips for tightness and examine the trunking for any cracks or splits and moreover all the vacuum system, the small bore pipes and fittings for cracks and missing parts. The best artifice to locate a leak is to have the engine executive and warm and later spray lighter gas /propane or brake cleaner all but each joint in turn. If the engine rev s happening you ve found your leak.
I did re-check them tho. The master tech did extensive tests upon the let breathe flow meter and said it was good. considering I unplug it and control the motor, the car runs sharp and at 850ish. I can lonesome guess that my other rebuilt ecu has an issue, or the tps needs to be re-adjusted, or someway my maf has died in the midst of all this. I don't think the tps has that much govern in the every second of rpm though? I think it lonesome adjusts it in this area 1k..
with I begin the car, the engine surges up together with 1200 and 2000 rpm urge on and forth. I untouched the IAC and the TPS like no alter in symptoms. I have noticed that several Lexus SC's have this same issue. Prior to this I would have to familiarize the idle eagerness screw to belittle the rpm and it would maintain for a while. Now, the engine is for ever and a day surging to the narrowing where I cannot steer it for alarm clock of damage to the drive train. Any experienced solution?