OK guys, its your turn to give me some ideas:
Between all the things I've done/had problems with lately, I don't know what could have caused this, but whenever the car is >13 mph the ISC sets itself to a very high setting, like 120 or 130! Usually, the ISC does go up to about 60 while cruising, if I remember correctly, but now it stays at 130 until I slow down to <13 mph. I don't know if its related at all, but I did have the brake problem last week, I had the A/C problem that turned out to be a bad sensor wire, and of course I've been testing several people's flaky ECU's lately. I've logged all the sensors, and everything looks OK!! I even looked at address C6 in the ECU which is the speed sensor, and it seems to be behaving the same as I remember it before. Has anyone heard of such a weird problem? What else could cause the ECU to want to crank the ISC up so high???

The speed sensor is in the speedometer. KC is gonna send me one, so I can play with it and document (hopefully) how to replace it with a cheap Radio Shack reed switch.
But, I don't think that is my problem, because I logged memory location C6 using the MMcD logger, and it appears to be working OK. It starts out at 226 when you aren't moving, and QUICKLY drops, until its only like 7 or 8 at 45 mph.
Plus, the car still does idle up about 200 rpm whenever its moving, which is the way its supposed to when the speed sensor is working right.
Thanks, and keep the ideas coming.

OK guys, for the records, I finally figured this one out: In case you ever have the weird symptoms of high idle until your car drops below 13 mph, check the 20 amp ABS fusable link. I had robbed it to replace my main ECU power fuse I blew while working on someone's ECU. Once I plugged a 20 amp fuse back in, the problem vanished! I thought it was ABS related, because I had noticed before, when the ABS was working, that everytime the ABS kicked in my rpm's went up.
Curtis, here's something else for you to try, that will tell you if it is ECU/ISC related: the next time it is idling fine, put the A/C on to raise the rpm's slightly, and then unplug the ISC connector. Try driving the car for a while with the ISC locked in that permanent position, and see if it stays low. It will be a hassle when you do cold starts, it may be too low, but it will tell you if the ECU or ISC is raising the idle. I did this to troubleshoot my problem, and it went away. Also, when I was testing an ECU that wasn't made to be ABS aware, it went away too, which lead me back to the ABS fuse.

Under the hood, near the battery.

ok well it seems like you guys are responding to this topic so i will throw out my question....

ok usually my idle is about 850-1100 depending.. well i put my a/c on and idle drops to 650-800. enough to make my car shake and not normal. I have played with my BISS and dont really have any other ideas. I have also changed my ISC motor with still no avail, just looking for some ideas...

thanks alot
dave

Dave (Doc_seuss) -- I was having very similar problems to you, and I did a couple things all at once that fixed it. I'm not sure exactly which one fixed it, but one (or all) of them did. I replaced the ISC unit with one I got from Gabor, replaced the throttle body shaft seals (which were basically not there anymore), re-adjusted the Throttle Position Sensor, and reset the base idle speed (properly, by grounding both of the pins that need to be). My ISC was testing good, but I replaced it anyway just to eliminate that as a problem. Just throwing some ideas out there, hope one of them might help.