ok i have a d15 it has been skipping so i figure i am going to pull off the spark plug wires one bye one to see which one it is... i pull #4 it starts running kinda rough...#3 it runs the same#2 it starts running real rough the it cuts off. now it will not crank, it isn't firing at all. i put a new dizzi, new ecu, new main relay, check to see if the dizzi has a good ground has power and it does. what else could it be....Thanks.