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Idle is surging between 1k and 1.6k. Cleaning the IAC valve didn't fix the problem. Blocking off the top port that goes to the IAC (inside the throttle body) makes the engine idle normally. The bottom FIT valve port (inside the throttle body) is sucking in air even when the engine is warm, and blocking the port doesn't change anything. Any ideas?
 

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Screw your fitv back together and go from there.
 
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