I have a 91 Supra with a 7M-GTE in it. I currently just picked up this car and I need some help with it. Recently I noticed the car started idling really weird and it revs from 1000 rpm to 1800 rpm back and forth from a start up, and at stops, and while driving. While I was in 5th gear cruising at about 50mph if I let me foot off the gas the car would still be holding 50mph as if the cruise control was on but it wasn't. But today I cranked it up and it jumped directly to 3K rpm and stays there. It doesnt raise or lower it just goes immediatly to 3k rpm. I was told many things could be causing this problem like cleaning my throttle body, my TPS might be bad or the ISC. The mods that are currently on the car that I feel can affect this problem is a Walbaro 255 LPH Fuel Pump braided fuel lines, Aeromotive fuel pressure regulator, and possibly some dry rotted vacuum lines(they have very small cracks in them but will be replaced soon). If anyone has any idea or could help me out with this problem I would greatly appreciate it because I have to park the car because 3k rpm at a cold start is asking for future problems so I am forced to let it sit until I have this problem resolved. If you need any more information on the car feel free to ask I will be checking this thread daily.
