Supra won't start.

[JustAnotherVictim]

As long as the belts are pretty tight they should be ok. When you shut off the car is the isc clicking? I wouldn't mess with the idle screw the ecu compensates for it anyways from what I've read.
It sounds like what's happening with mine right now. I haven't pinpointed it just yet.

 

[87CandyBlueT]

ISC clicks several time yes. It's working. The problem with my ISC was that the valve was covered in carbon deposits I mean really thick so was the check valve and it was installed without a gasket. I got the gasket and check washer from the stealership for like $8-9ish and cleared my problem right up. When my ISC was like that it surged like crazy and it would die sometime idling and after downshifting and wouldn't start back up right away, I almost thought it was a fuel system problem. Hopefully some tinkering and double checking everything will work the problems out. Don't have a garage at the moment so I gave in for today as it started raining about an hour ago. My adrenaline is still pumping from driving it though I just want to go boost some more, but I don't want to drive it until I have it operating right. Anyway thanks for your help/response, let me know if you get your idle fixed. After re-installing the ISC I had to make some adjustments to the idle screw and the stop screw which is at the far right(when facing engine bay) of the throttle linkage little bolt with a nut, you can use a flat head to adjust the stop screw.

 

[JustAnotherVictim]

Right now for me i'm leaning towards vacuum leak or afm. I won't know for sure until I get home.

 

[87CandyBlueT]

Good luck with it, let me know how it works out.

 

[JustAnotherVictim]

Ok well I feel like a noob now but it ended up being I had spark plug wires #2 and #4 swapped.
After that it ran like a champ. I could have sworn I did those all one at a time but I dunno.
That was my problem.