back in november I got the transmission rebuilt,along with front brakes, starter, u joints, tensioner and serpentine belt all replaced. a short while later my serpentine belt started squealing/twitching. At first it was just while it was idling, now its a constant thing. I had the idler pully replaced and the noises went away almost completely until I started driving it 15 minutes later. It came right back. Ive had a few different opinions but nothing ive heard seems to make sense. Any ideas?