I am currently having a problem with my engine when my Nitrous is activated. it is on a full throttle switch and is a fogger system. When i go down the track my tach is bouncing back and forth and the motor is breaking up. I replaced my 7al2 box and my 2 step box and by passed my start engine retard and my engine still does it. when i make a motor pass it is real clean. i have redone some of the ground wires and replaced the plugs, wires, and ignition boxes. Any body have answers or suggestions. All responses are appreciated!