I have a 06 tj 6 speed. Just recently I have been hearing some type of noise coming from the engine. At least I think its coming from the engine. Every time I step on the gas it gets louder. Then shift slows down but once it starts pickin up rpms it gets loud again. Or if I just let off the gas it still makes the noise. When I push the clutch in for the most part it stops. It sounds like its going tst tst tst tst tst. Sorry about the abbreviations, but its hard to describe what it sounds like. Maybe a valve tap or some sort? Any ideas?