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Super Moderator
1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
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Vacuum leaks would have been my first thought. Look for a high TPS signal voltage or a sticking IAC?
A scan tool may help in diagnosing this. Any mechanical sticking at the throttle plate or cable?
Check for vacuum leaks with a water spray bottle and listening for speed/hiss changes?
 
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