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I have a 2015 F250 and I took it out for the first time today. Ran great on the run out I run a kicker for fishing so after I was done fishing I ran the 250 on the way in and it developed a stutter. Seemed like a cylinder dropping as it would do it intermediately. I only could run it for a short period of time as it was starting to get rough. It seemed to be more prevalent under heavy load on takeoff or hard acceleration. I pulled all the plugs and the bottom port cylinder appeared to be a tad bit darker around the outer ring of the plug. Getting new plugs tomorrow anything else I should check?
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