I had something similer and changing the coil fixed it... Did you buy the dizzy from somewhere local.. AUTOZONE or NAPA or something? Do you know any one with a good dizzy that would be a way to find out if the dizzy was bad. Possible ECU problem or wire problem, or vac leak (use carb cleaner around the intake gasket and where vac could possible leak) if there is a leak it might smoke alittle out the exhaust or it will try and die. Those are the 3 things I would try first and knock them out and if it still happens let me know