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Old 12-18-2011, 03:39 PM   #1
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Routine Maintenance

My GT has ran great up to about 3 months ago, it started hesitating slightly which eventually got worse. I changed the sparks plug and the problem stopped. Then a month after that it started again but even worse, well after inspection of the spark plugs i noticed oil on the tip, i changed the coil pack, The hesitation went away for the most part, but there is still a slight hesitation and im still not getting my power and the response when i punch it is not good at all. What other routine maintenance should i try...I have a fuel filter but have not yet installed it. Im thinking maybe i should try changing all the coil packs but there not cheap..And i would need 7 im hoping its something else. The engine has 150,000 (mainly highway) miles. Ive never had any problems till recently. Thanks in advance guys!

04' mustang 3.9 40th Anniversary Edition- (V2 Vortech Supercharger, 38# injectors, 3.73 gears w/ T-lok, Predator Diablo, Mac cold air intake, Port & polished upper AND lower intake manifold, Mac Long Tube Headers, Mac o/r H pipe, flowmasters, 2.5 flowmaster tips)

03' Mustang GT (20" Cobra R's, 40 series Flowmasters)
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Old 12-18-2011, 04:30 PM   #2
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I had the same problem. I changed my plugs and still had a problem. I went to AutoZone and had them hook the Machine up (for free) and it told ne which coil it was. I only had to get one coil. They are way to costly to change all of them at one time. If I had the money to blow I would have changed them all. Personally I'm going to just change them as they go out. Hope this helps.
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