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Have a 2000 Taurus, FFV 3.0 12V engine. 90,000mi. I has just now started to idle rough after start up with at least an 8 hr. cool down time. Engine light came on, had it checked, shows misfire, #2. Any ideas what I may be looking at here, like injector, wire, plug... Had plugs and wires changed at 50-55K mi. I put in two bottles of Chevron gas treatment, to see if it may be an injector that was carboned up... After car runs for about 3 minutes, smooths out...Any ideas would be appreciated.. Not time yet for a fuel filter, but do not believe this is what is causing this. Thought maybe water in gas, but car gets better after warmed up ? Thanks in advance...
 

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While you're cleaning IAC valve, take out accordion hose that goes to the throttle body and check for carbon there. Might be good idea to give it a clean.
 

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