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This weekend I changed sparkplugs on my 99 F250 5.4L V8...hoping to cure it from misfiring.
I got them changed and it ran the same....if not a little worse.
This morning I had AZ hook it to a code reader and pulled up a bad COP on number 4.
I know that I moved the #4 COP to #1 plug this weekend, so my question is....is the bad COP #4 or is it #1 now???