Joelpetersen
Junior Member
I’ve got a 2011 2500 ram with the 5.7 hemi. Issues is when truck has sat overnight and started in the morning. When you go to drive it’ll stumble and hesitate and the more throttle you give it it’ll just stumble for 20 seconds then power through it. After driving for 5 minutes it doesn’t do it at all. Spark plugs are new. Code p0300 come on briefly sometimes when it stumbles. Data logged it and #1 cylinder gets highest misfire count and a few other get some. Only misfires when cold and under that slight load of initial acceleration. Otherwise no misfires and runs great when warm and tons of power. We did upstream O2 sensors and it seemed to help that the issue doesn’t last as long and less noticeable. Seems like fuel/tune issue since O2’s helped. Don’t want to start throwing parts at it and not solve it so just wondering if anyone has had same issue with a common fix?
