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Runs smooth then rough then smooth
I have a 2000 Excursion 7.3.
When i start the engine runs fine then after a couple of min starts running rough kinda of like the wiring harness is faulty like running on 4 cylinder. After a few mins goes back to normal.
This only happens with its cold kinda of like a set pattern. No SES light.
The ECM was replaced about 8 months ago and CPS sensor.