hi sorry to hear about the vr not growling !dodge did you time the cams when you put the engine back together or was it complete when you installed it? the reason i ask is because if the cylinderhead was replace you would have to time the cams and people know that it can be tricky and cause missfires if not done correctly what rpm does the car miss fire if the engine was running before you replaced it then i would look at 1 plugs and gaps 2 leads ( check in the dark and look for and lsten for the spark jumping to the cylinderhead (it has happened to me due to bad leads) 3 correct grounding