My car was down for a few monthes. Now it has a new coil, opti, ignition control modual, and spark plugs. I seem to have a bad miss almost like I'm running on 6 or 7 cylanders and I back fire at idle? Any ideas? The car is a 355 lt1 with a cc305 and tame tuning.

 

Also, I pulled the valve covers and reran the valve's. Everything was good. No broken springs.