OK so on the way out of auto zone my b20b just cuts off. So I check all the normal things. And notice that the timing belt is lose !!! One of my fears. Knowing that I just replaced my head with an ls head that has less miles on it. I'm hoping its something easy to fix. So the belt had a lot of slack in it. So I just go in auto zone and replace it. We make sure all the timing is right but the tension pulley is acting funny. The belt will not stay on right when its idling. Dose the tension pulley go bad and if so how easy to replace? It will start in when we change the firing order. You know that there is always someone who thinks they know everything and is telling me that its a bent valve that's not letting my engine start. But my last head head a two bent valves and still started. It just had a off idle. What do you guys think?

 

im pretty sure its timing cause im going thru the same problem cause if its off the intake or exhaust came will not allow the correct piston to fire at the correct time