2007 Mercury Mountaineer Cylinder 5 Misfiring

2007 MERCURY MOUNTAINEER
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JNMOSQUEDA
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Shakes or Wobbles problem
2007 Mercury Mountaineer 6 cyl Two Wheel Drive Automatic 71K miles

Do you know what could cause for my check engine light to come on, as well as Gas cap light? I went in to an autozone and purchased a new one after clearing the code on my OB II, for a loose cap or bad cap. After 3 days it came back, but not only that but cylinder 5 is misfiring. I tried switching the wires to distingish if it was the wire and/ or coil pack, but got the same code (cylinder 5 misfiring). I went back to autozone and purchased a coil pack, but still the same what else could it be?
Apr 23, 2010 at 3:10 PM
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MHPAUTOS
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Hi there,

Thank you fore the donation,

With a single cylinder miss fire, check the plug, injector, compression and vacuum leaks around that cylinder, start here.

mark (mhpautos)
Apr 23, 2010 at 4:12 PM