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Q:

IDLE AIR CONTROL OVER SPEED ERROR. on 2001 Ford Escort

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
the canobd2 diagnostic tool gives a reading P1506.
(1) Answer
First, remove IAC and clean out all carbon and reinstall. Also, look for weak, collasped, broken or poorly seated vacuum lines. Lastly, replace PCV valve with a new one, it is probably due. Hope this helps you.