Make sure you´re coil is grounded properly, your plug gaps are proper.. or new plugs and also check the resistance on your coils. They should be really high.. the boots should be 10 ohms and the coils themselves like 90 or 100 ohms. Also.. the connection where your boot goes into the plug wire could be messed up. so snip a bit off and thread the boot back into it. Check for ANY wiring connection in the circuit that could be even a little loose.