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post #1 of 3 (permalink) Old 06-11-13, 09:32 AM Thread Starter
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Engine misfire

Need help. Have been chasing a mis fire condition for 2 months. I get code P0305 which is a cylinder 5 mis fire. I have changed all 8 plugs, all 8 coils and spark plug boots. I even changed the timing solenoids on my 2004 F150 w/5.4 L. All this and still have the same miss. What am I over looking?
THKS

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post #2 of 3 (permalink) Old 06-11-13, 12:18 PM
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Re: Engine misfire

Checked compression on cyl ?
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post #3 of 3 (permalink) Old 06-11-13, 05:09 PM
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Re: Engine misfire

Could also be an intake manifold leak.

Ever notice that there's so many high performance parts available for GM products?

Did you ever think that maybe they NEED them?
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