Re: Mechanic Help Needed!

I'd take a close look at the timing belt, all the way around. I've seen them shear the teeth off the belt and it would only have to be a small area to let the crank spin out of time.
Belt stretch/ bad tensioner

while you're in there check the pulley mounting. If it's a press fit it could slip.

Hope you get it figured out and fixed quickly and cheap.