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rpmdiag, Tech and Instructor
Category: Ford
Satisfied Customers: 6715
Experience:  Since 1975
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F 150 runs rough after warming up

Customer Question

f 150 runs rough after warming up
Submitted: 3 months ago.
Category: Ford
Expert:  rpmdiag replied 3 months ago.

Hi, I’m Ron and I’ll be helping you today.
Before we get started though, Please understand that I don't know
your skill level or tools you have to assist us. Also understand that
I can't see, smell, hear, or touch the vehicle either, so patience is
appreciated. JA is a great Q/A site, but it does NOT replace a
repair shop.
My goal is to make you happy and get a great rating in return for
my time. Sometimes I have to give you bad news that I know you
didn’t want to hear, so please don’t shoot the messenger.

First check for vacuum leaks externally with water and internally with a smoke machine on a cold engine then a warm engine. Lower intakes leak on those all the time causing the issue you're having. A scan of the computer is needed to so try a different scan tool if yours is not communicating, then diagnose from there if needed. Let me know what's going on.

Thanks, Ron