if the crank sensor was bad, the engine wouldnt start.

Do a leakdown test to find out what your internal parts condition i, and then work on the rest of it to get your power back up.

 

You need air, fuel, compression and spark to move your intervals. You obviously have air, you could have too much fuel but nor likely, so maybe you're losing compression or need to change your spark plugs. It's possible the cat is full of carbon.

 

Thanks for the ideas, the engine compression is ok as of today. I already had the cats tested and they're alright, along with the spark plugs. I havent investigated the fuel pump but I dont really suspect that, im sure it has something to do with when the harmonic balancer broke apart no one can figure out what though. Perhaps somehow my sensors are sending back wrong data ? Is that even possible?

 

Did they check the timing at the crank? Just because te timing is on at the cams doesnt mean its on at the crank.

 

Or did they check ignition timing?
Usually when you go to a shop and ask them to "check my timing" they check ignition.

 

Tell us. Did it happen all the sudden, or just got a little worse evey day. You also do not have an after market Harmonic balancer. You just have an after market pulley. I don't like em, but that's a different story. I have a feeling you need to pull your fuel filter and try and bloe through it. (use a hose) also could be a vaccum leak between you Mass and throttle body. Unmettered air will make you too lean for power.

 

This happened all the sudden, right after the new pulley was installed.

 

As I noted earlier, you need to find out if the timing belt is lined up. Someone else noted the garage may have checked ignition timing, or if they did check the timing belt, they may have only checked the cams. All 4 cams and the crank need to be lined up or there will be severe power loss.