Ok I'll make this brief. I have a 90 coupe, exhaust, small cam. Basically I was having a misfire 3500/4000 ish rpm. Off the top of my head I decided to change out my Accel coil with a stock one that was on the car. It took care of the misfire. However it may just be me but the car does seem a tad bit slower. Will a better coil add any performance on an otherwise stock ignition system. And also are Accel coils known to go bad this one was less than a year old.