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Ok my 4.2 V6 has #3 cyl misfiring according to autozone. Rulled out almost everything but the injection system. My local Ford dealer ganged up on me and talked me into "cleaning" the injectors. They ran it on straight Gumout for about 20 Minutes. It ran great immediatly after that but has been going back to its old ways.
Autozone (who I dont really trust) has an injector for for $40.00 and they say to treat them like a light bulb and replace only the one that is bad. Ford (who I trust to break me) says change them all at $120.00 each. Any reason that I shouldn't change just the one?