Hey guys I have noticed lately that when my truck sets for a while (3+ hours) I get a ticking noise for a few seconds at startup after that no noise. It sounds like lifters ticking. Now I know 4.6's don't have lifters but thats what it sounds like. I change my oil religiously and I'm less than 2k on this oil change. It just started doing this about 2 months ago. Any ideas?