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Re: 1993 F140 4.9L - Bad Miss When Warmed Up
With your added info, my next guesses % wise would be a dirty IAC or a hanging injector. Or dirty injectors in general causing poor fuel atomization. Poor fuel quality as mentioned, sure wouldn't work in your favor. Two of my favorite products are Lucas Injection cleaner & Seafoam. There is always a noticeable improvement & the Seafoam is fun to use (you'll see what I mean!): How to Seafoam an Eighth Gen F150 (1987-1991) - Ford F150 Forum - Community of Ford Truck Fans
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