So lately I've been noticing a strange almost grinding but not quite, more of a whirring noise coming from my intake manifold. If you put your hand on it, you can feel the "amost kinda grinding" action. I pulled the cap on the oil filler to see if I could hear it better, didn't really change anything. Any ideas? On a side note, I did a timing belt 3 or 4 months ago, and did all new belts and everything. Now I'm starting to get an annoying chirping from my belts when the A/C is running, and under decent acceleration when the engine hasn't warmed up it will squeal for a split second and almost lose power for that split second, then kick right back in. The annoying belt chirp is typically at idle at a light or in the drive thru...please advise guys...thanks a bunch.