ZoomZoom04

I have a 94 gt... it has a crane cams fireball coil with an msd 6a box and a billet dist. I took the spout out because it seems to run better without it. Im a college student and dont really have the time to do much work on it right now. Anyways when I drive it for about 20 mins it dies out and seems like the timing is really off. Lots of backfire and really stumbly. It seems to happen more when its hot out. Any help on what it could be would help.