Bad fuel or bad injector or?????
I topped off my 6.0L the other morning at Wal-Mart, about 15 miles later the truck started running rough. It got so bad it died on the side of the road. It restarted and continued to run rough then normal and back to rough, max speed would vary from 30-75. When I got home I drained about a gallon of fuel from the filter drain with no water. We changed both filters with a few water particles around the engine mounted filter. I figured this would clear up the issue but it has not. It know runs for the most part ok, but idles very rough if its in drive at a stop light. You guys have any suggestions? I did add quite a bit of fuel supplement after this problem started.