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Steve is right to suggest that you check the function of the TPS. I had the same symptoms and mine was TPS related, but the TPS itself was fine. There is also a set screw on the back of the throttle body (TB) which in my case needed to be backed out to allow the throttle to close completely. Even after making that adjustment, mine was still high!. Turns out the linkage between the pulley the throttle attaches to and the throttle body (the rod with a ball and socket joint at each end on the front of the TB), was also adjusted too short to allow the throttle to close completely.
You probably need to remove the TB to set the TPS. Since the first step of that job is to disconnect that rod I had trouble with, I would disconnect the rod with the engine warm (good idea so as not to break the plastic clip on the ball and socket joint anyway) and restart the engine to see if it idles normally. If it does, just screw out one ond of that adjustable rod until it is long enough.
If you have to remove the TB anyway (which really isn't a big job), get some throttle plate cleaner (not carb and choke cleaner) and clean it out. Also get yourself a new TB gasket.
The best of Luck,
Andy '91 745 Regina 184K, '89 244 135K, '87 245 lost the rust battle at 225K
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