Help please! I have a 2000 F-150 w/ 5.4! Replaced head on driver's side and now vehicle idles great; however, when driving get really bad sputtering. If punched sometimes it smoothes out. Do I have an injector problem?

 

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It could be a bad coil (cop). Is the CHECK ENGINE LIGHT on?

Was it run like this before you replaced the head?

 

No, the check engine light has not come on!

Canty

 

my truck started to do this 2 weeks ago - the problem comes and goes - sometimes the idle is smooth and other times you can feel it skipping - when I punch the gas it puts in the passing gear and smooths out. I wish whatever the problem is would throw an engine code so I can at least find out wnat is going on...

 

It may have a code stored. Scan it and see if anything shows up.