Well that is the other reason that i was planning on getting the box was because i am having a misfire problem on my 1-3 cylinders and no other. I have changed plugs and wires and it did not change anything

 

In that case I would suggest a new Opti, either the MSD or GM OEM unit will work fine, but I would stick with an Opti unit to keep the engine bay as uncluttered as possible (we both know how crowded it is normally, the last thing you need is more crap sitting in there).

 

yeah that is for sure ok well thanks