Check for vacuum leaks. IIRC the C series ford trans are vacuum controlled, and act dumb when leaking. With it running, spray carb cleaner on any lines u can see, and then the one at the trans. Idle goes way up, u found the leak. If it's a big enough leak, you'll hear a sucking noise upon close inspection (if it has headers or a glasspack, like most of them have, dont bother listening for it)

~Nate

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95 Honda Shadow ACE 1100.
1999 Plymouth Neon Expresso. 2.4 swap, 10.5 to 1 comp, big cams. Autocross time attack vehicle!
2012 Escape, 'hunter" (5 sp 4cyl)