terrible revving situation... halp please!

[codyo]

So the car is an 84 jetta, 2L 16v, ran by ce1 motronic.
Drag raced a 350z right before I got home and parked it, so had just driven it pretty hard.
Went to start it the next day and it revved up to 3k rpms. Turned it off and waited a couple seconds, started it back up and revving like crazy.
Unplugged the battery negative and waited a couple minutes. Hooked it back up and started it: ran at about 4 hundred rpm. Shut it down again.
Cleaned ISV, reinstalled and no change.
Installed spare computer and no change.
Bought another ISV (used) and in stalled it, no change.
Any ideas? Help would be awesome... I built the motor bolt by bolt but troubleshooting is a weakness for me! Thanks guys

[codyo]

Still can't figure this one, anybody got any idears? Spent awhile on it yesterday, couldn't find any vaccuum leaks or anything. All the sensors on this guy are pretty new, I have about 6500 miles on the full rebuild and replaced everything while doing so. I did get the air box and fuel distributor from a junk yard though... never really went through it.
Besides that, any probably unrelated, the fuel pump has a thousand miles on it, fuel pump relay has a couple hundred on it. Also recently, within the last 500 miles, had a shop install some 254 lift cams and I put a 2l 16v chip in it.
Has been running perfectly -surprisingly reliable and powerful- and ran great when I'd parked it the day before the trouble started!

[codyo]

Figured out I had the wrong fuel distributor/potentiometer in the car. Found the right one at the yard and installed it yesterday. Tested resistance on it and is within specs. Also installed ANOTHER isv, no change. Have tested all sensors and seem fine: coolant temp, tps etc.
Really losing my s#$t here! Any suggestions at all here? Starting to run out of options.
Have recently changed fuse box, fuel pump, fp relay, most everything in the car is newer, I like to replace anything questionable with new.
This has kept me from backpacking two weeks now... really wanting to get up to the mountain/drive my car in general! Any guesses, even, would be apprecated! Thanks guys