2005 Magnum 5.7L V-8 75K miles
Very rough miss, like it's running on 7 or even 6 cyls. Until warm (190-200F), then it runs great. Have CEL & codes P0300 & P0308.
This usually only happens on the first start of the day, or when engine is totally cold.
Sometimes it will be in " rough mode" from the minute I start it and stay that way regardless of RPM until it has warmed up.
Sometimes it will start with the touch of the key and idle fine, but if I increase RPM before the engine is warm, it will then go into " rough mode" and stay that way regardless of RPM until it's warmed up.
Since the problem started, I have replaced plugs and EGR valve, and changed oil & filter. I have swapped coil packs and wires between cylinders (still get P0300 & P0308) I have used fuel from multiple stations.
I have checked as well as I can for a vacuum leak.
Any other ideas before I take it to the dealer and spend $$$$?
Thursday, April 5th, 2007 AT 6:41 AM