I'll try and keep this question short. Driving Car the other day(440-6 Superbee) and it started backfiring and mising out over 2500 rpm. pulled over changed out ballist resistor and everything seemed fine, drove another 30 miles no prob then on way back home bam!! started doing again, I just swapped old dist(dual points) out with Mopar Elect and fires right up revs into 4000 rpm range no problem idles fine,etc. went out for drive and under acceleration starts missing out and backfiring, let off and runs fine?? I've replaced the coil also with new accel superstock unit, new dist,cap,rotor,and ballist. so i'm kinda at a loss, Before the other day car has been driven alot with no problems.