i have a 2003 350 mpi.. when mine behaves like that its usally the cap and rotor. i would hear popping under the engine cover,you would be supprised it messes up every year i keep a spare set up on board.
Just recieved the new rodholders yesterday. Now there is a spring loaded pin to lock in the vertical adjustment. Will try them out next weekend and will try to post a picture of rodholder later.
Hey Guys
Just found out that traxstech has reincarenated the the vector rodholder for scottys. part# SCT RH1. Not posted in their online catolog yet but they have them