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High idle problem


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Has anyone ever had a high idle problem when shifting gears. It's kind of intermittent and it seems like it happens more in the heat of the day after I have been in traffic a while. 2007 SGT approx. 58000 miles all stock.

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yes. i have experienced that on my 2006 mustang GT and determined it was related to an aftermarket tuner. recently saw this happen on my 2007 GT500, but since it's running a Ford Racing tune, i think it may be related to my alternator going bad. i was having starting issues so i recently bought a new battery. still had the issues so in testing i noticed that my alternator is undercharging. haven't replaced it yet, but my theory is that the computer is compensating for the lower voltage by over-revving slightly. i am no mechanic or electrician so this is purely a guess.

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