I am having a problem with my TPI running rough when it is in closed loop mode (while cool). I can fire the truck up in the mornings and drive it ok and it runs pretty well and once the open loop kicks in everything is fine. If I let the truck cool off after driving it like I go into the store or something and it cools below the 185* (or whatever) for open loops it runs poorly when I start it up and try and drive. It runs rough and the idle jumps all around from 600-1000 and back and forth. The motor tries to die then the computer catches it and kicks the RPM up and then it goes down again and so forth. In gear it acts all surgie and this is very bad when you are trying to rock crawl in technical areas. Once the truck heats up and hits open loop it is fine again and everything runs normal. I need to get this problem fixed because I am having problems offroading it cause when I am waiting in line for an obsticle out rock crawling my truck will kick into closed loop mode and run like crap until I heat the motor back up again. WTF is wrong? I am kind of thinking TPS input might be screwy but I don't know. It trips no codes in the computer at all............. Harley P.S. 1988 MAF TPI off a Firebird no VSS (running in Park mode) on a stockish 350.