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2001 f-250 p1316,p1277

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Got an 01 f-250 runs rough all the time.Got p1316 continous and p1277.P1316 led me to ppt fj9.Which tells you to run self test and see if any other codes are stored. If yes tells you to go to appropiate ppt test for that dtc.So i went to ppt for p1277 which is NA11.Followed NA11 measuring high and low side resistances for that injector circuit which is 7 from the glow plug connector to the idm connector.Resistance was in spec. Could this be a possible Valve cover gasket issue?

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The under valve cover harnesses are notorious for getting burned because the glow pug pins and wires are a little small for the amperage load they have to carry. Generally the lock breaks and the connector has a loose connection, on the newer ones. Usually it will cause and intermittent miss. However if the connecto has been loose for a while, it is possible the pins are burnt so bad they wont make a connection anymore. It is a cause worth checking out. Sorry it took so long for a response, my computer crashed making it difficult to log in. I am surprised nobody else has responded to your questions

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