I have a problem with my vehicle...I have had some issues with the engine missing and sputtering when accelerating. Each time I start from a stop the engine misses and will backfire. The backfire has just strarted. I had the problem of the vehicle missing when accelerating and I had the opti-spark control module replaced. The problem has been becoming more pronounced each day.

 

it could actually be the optispark distributor itself, check it for play