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Q: after 20 to 30 miles my truck picks up a bad miss at lowend and overdrivw on 1999 Ford F-150

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
missig bad after 20 miles or so a small miss otherwise only code evap leak but has been there before miss started
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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Also you can have a cylinder contribution test performed with a scanner, most likely an ignition coil or coils failing.
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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