I have a 97 banshee, hot rod rods and crank, vitos super stock pistons .060 over, ported cylinders, boynsen reeds, pro circut pipes, stock carbs with 300 mains and toomey needles set one down from the top, new dyna adjustable cdi box, new coil, stator and pickup coil from rickey stator, brand new b7es plugs, noss cool head with 20cc domes, all the tors crap is removed. The problem is that the thing runs very strong but it only runs when it wants too. Somtimes it will start up and run great for about 30min and then it will start missing and backfiring and will not start back. It you pull the plugs they look great they are a milky brown color. When you try to start it it will run for about 1 to 2 seconds and then quit even if you try to pull it off. It will keep that up for days and then you can just do somtning stupid like switch the position of the coil wires or un plug some connector for the 20th time and plug it back and it will run again for a while and then start doing the same crap. Ive searched for this problem for about a month now and cannot find a bad connection anywhere. What do you all thinK it could be, help please!!!!