I had the same problem for awhile too. It was random but deeply disturbing. I replaced the IAC with one from AutoZone (didn't work), Napa (didn't work either) and finally bit the bullet and got one from the Ford Dealer. I should have done that earlier b/c that DID solve the problem.
Rob
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89 LX 5.0 Notchback,
FINALLY NO LONGER STOCK!
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