I recently had the 60K scheduled service performed on my Ram. I'm getting a P0304 code that has repeated. The only time I have noticed a slightly rough idle is when the truck is started with a cold engine. I also have had one stall at a stop light since then. I want to check the plug (make sure it was actually replaced) and also that wires are secure. It's been a VERY long time since I did any DIY work... andcan't remember the cyl config.If I stand in front looking at engine, is cyl 4 the first one one on the left? Any other DIY suggestions for P0304, please post. Thanks and regards, Scott.

 

Cylinder 4 is the 2nd cylinder, passenger side. Swap the coil with another coil from a different cylinder and see if the misfire goes to that cylinder you swapped it with....these coils are a known bad item when i was working at the dealership

 

check the plugs. maybe the mech. did not gap them correctly.

 

Thx for the posts. Once I got my head under the hood I saw that the coil wires have the cyl number on them. I swapped the coil with cyl 2, cleared the code, and I'm waiting for the next code. Regards, Scott.