I have a 2001 F150 Supercrew 5.4L that when idle runs fine. It seems to shift ok but when I am driving down the road the engine seems to miss when I get to the 50 - 60 mph range. I thought I may have water in the tank, but I have been using stp every time I fill up. I appreciate any help given.
Last edited by daktiner; 03-28-2009 at 05:33.
Reason: forgot some info
I agree, get a scan tool and see which cylinder has the misfire, and then try switching coils from the known mis to one with out. If the misfire moves to the cylinder that did not have the misfire before, you know it is a bad coil.
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