2001 Ford F-150 xlt 5.4 Triton Burning plugs
#12
I don't know the answer to that. I guess it is possible for carbon to accumulate in the combustion area if the plug was misfiring. Looking up the road also possible some damage might have been done to the involved injectors by the folks doing the repairs, don't know! Have you considered doing a compression test to rule out any cyl damage?
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