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After 20 to 30 miles my truck picks up a bad miss at lowend and overdrivw

(1999 Ford F-150)
in Burnsville, NC on November 15, 2013
missig bad after 20 miles or so a small miss otherwise only code evap leak but has been there before miss started
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Popular Answer
on November 15, 2013
Also you can have a cylinder contribution test performed with a scanner, most likely an ignition coil or coils failing.
of Greg's Orange Auto on November 15, 2013
poss alot of things do you have any eng codes?
on November 16, 2013
From the description it sounds like you have a type-a ignition misfire, the threshold for setting dtcs on older fords is broader so they won't set a code as fast as a newer ford. You'll need to take it to a shop that has a power balance test capability that will show exactly which cylinder is misfiring to get an accurate diag.
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