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My F350 started running like it had a miss yesterday. Lots of smoke and rough running. It was raining and cold out. This morning it was the same. I let it warm up and went to a trans shop to put it on the computer. I drove about 3 miles and maybe a half mile before I got there it started running fine. I had him test it anyway. It only had one code - PO 541. Would the intake heater make it run rough? And if so what made it go back to normal? Thanks for any help.