Join Date: May 2011
Location: Frederick MD.
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Wow, that does sound rough when you hear it thru the exhaust. Does it have a definite miss to it, not just at idle but thru the whole rpm range? Does it ever smoke at all? I've seen the rocker arms crack, causing them to get a pretty hard miss to them. What's weird about that though is it's usually accompanied with some pretty good white smoking, seeing as the injector will still be spraying fuel, but due to the rocker being broken it's not firing well.
Anything like that should have logged you an cylinder misfire code. Recheck your codes and see if it has one logged. Then I would pull the valve cover on the hole that is lists. Pull your high pressure oil rail and check the rockers. If nothing is found there I would do a compression test next.
If it's just a rocker it won't be that bad to fix. You haven't had the intake off recently have you?