Hey guys I am running a MSD 6al set up with MSD probillet dizzy. I was wondering if anyone ever had one go bad on them?? If so what were the symptoms if any?? Or do they just die and quit working.? I am asking because i took the car out over the weekend and it developed one hell of a miss. It will buck and cough/puke and shut off. hit the key and it fires right up but misses pretty much continually. I was hoping it was fuel related. Pump or bad gas. But im leaning toward the oldest component on my car which is the mds box. Im gonna start switching out some spare parts i have laying around to determine what it is. I have a spare coil. and a points dizzy somehwere i think. Also gonna go down and get the boat tank and electric fuel pump out of the derby car to see if it is fuel related. Its hard to say what it is because everything is pretty much brand new. Tank,lines,filter,carb all new. Plugs, wires, dizzy msd box and coil all new. Maybe water in gas?? I dont know just have to start eliminating this and chace it down.....Its either fuel or fire!! Just wasnt sure if a msd box would make it miss if it was going bad???