2000 gt 3.4 with 193,000 miles. It just started making awful loud noise and when I popped the hood, the belt wasnt moving at all. I slipped the belt off and started turning some of the pulleys. There is a smaller one below the water pump and power steering pump, above crank pully and above AC pulley. Is this a pulley for the camshaft, or is this just an accessory/pivot point pulley for the belt? This pulley will not rotate in one direction, and is very stiff to rotate in opposite direction