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Ram 2500 6.4 pO300 on cold start up deal is blaming fuel but it only does it when cold out side also a little rough at idle.
You had this problem didn’t you? I remember this.
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Dealer tested fuel and told me it had and small amount of water in it and over ten percent ethanol but I’ve gotten gas there at the same place for years and my wife to with no problems. It seems to throw the code below a certain temp out it happens in open loop before warm up and been running mid grade fuel.