you know, that could've been your problem all along. If one of the valves wasn't opening and closing all the way, then it could make it run like crap. Then when the rocker started loosening up, then valve was operating correctly, and now it just loosened the rest of the way.
Check for bent pushrods, but it's most likely that a rocker just came off and the pushrod is just being slung up and hitting your valve cover if the noise is very loud. If it's not too loud, then it's probably just a loose rocker.
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