Good morning. 2000 F150 5.4 with 127k. Engine underwent a complete tune up about 3 week ago and also new right bank head gasket. Major $.
Today after running about 10 minutes and getting to speed on the highway I experienced a buck/skip of sorts then it cleared for a few monents then started skipping continually at all speeds and expecially when under light load. I'll be bringing it back but what are some of the possible causes. I can recall the buck/skip once in the last two weeks but chalked it up to maybe slipping off the pedal getting on the ramp. Could this be a sensor of sorts that's faulty as it transitions from cold to hot?

Looking for clues.

Thanks,

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I just went out during lunch and it was doing it right from the start. This time the check engine light came on about a minute into the test ride.

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First, take it to Advance Auto or Auto Zone, and have them read the codes. Then post the codes up here. Intuition, and expirience, tell you you most likely have a misfire. But post the codes, and we'll go from there....