As of late Ive been havng problems with my 1995 Z28 stumbling a bit at idle and having it continue half way through 1st gear. At one point it was bckfiring quite often.

I just had my opti, harness, plugs, wires, coil, o2's, etc replaced within the past 9 months. anyone have any ideas?

 

Sounds like you have a mis. Look for a dead cylinder.

 

even with the problem just being in the low rpm's?