I have an 04 with the v6. I have a problem with it running rough when it’s cold. Its fine after it warms up or when not cold out. Diagnostic said coil number one and two are bad. Replaced them again with motorcraft stuff and new spark plugs. After a week it’s back to doing it again. It said coil number one is bad. Actually says misfire on cylinder one. What could be the problem if it’s constantly saying new coil is bad?