I have an 06 Hemi w 99k miles on it. Getting a cylinder 1 misfire code. Changed all the usual items, no luck. Pulled valve cover, found valves open/close with engine cranking, but stop moving when engine starts. Believe it's a MDS issue. The truck has the proper weight oil in it. Hooked it up to a diagnostic reader, checked MDS soleniods, #1 cylinder solenoid makes the same sound the other solenoids do. Don't want to pull the intake to change the MDS solenoid if that's not the problem. Pushing the tow mode button in does nothing, truck runs terrible. Anyone experience the similar issue? Any suggestions.