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Old 03-28-2009, 05:30   #1 (permalink)
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confused miss when driving

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
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Old 03-28-2009, 20:59   #2 (permalink)
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Re: miss when driving

If you suspect having water in the tank, use a fuel drier. STP won't help you much with a water ptroblem.
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Old 03-29-2009, 05:28   #3 (permalink)
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Re: miss when driving

I am not familiar with fuel driers, is there any brands in particular that are better than others?
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Old 03-29-2009, 14:11   #4 (permalink)
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Re: miss when driving

Quote:
Originally Posted by daktiner View Post
I am not familiar with fuel driers, is there any brands in particular that are better than others?
Heet is the only brand that comes to mind. I guess one is as good as the other, Isopropyl alcohol is the main ingredient.
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Old 04-03-2009, 06:39   #5 (permalink)
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Re: miss when driving

if you the 01 has individual coils most likely one or more of your coils is bad.get diagnostic on it and find out if any of your coils are misfiring.
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Old 04-08-2009, 20:29   #6 (permalink)
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Re: miss when driving

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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