Should I put my tb screen back on?

[GMCARS4LIFE]

It is likely f'ing the tune up badly. The screen is to direct air across the maf sensor. If the pcm is programmed to read the air a certain way and you change that, you should retune the car for the change. Doesn't appear that you have done that.

Check your fuel trims and O2 readings. The car may feel a heck of a lot faster, running lean will make it faster and much easier to do damage to the pistons etc.

Do you mean it will feel faster with it off? Anyways I put it back on and my car runs much better.