It seems to be an electrical problem...
Here is an interesting read on Mopar ballast resistors.
http://www.tidewatermoparclub.com/TECH/ballast2.pdf
MSD Blaster coil is low impedence, so it does require a ballast resistor. MSD site has some interesting info as well.
http://www.msdignition.com/product.aspx?id=5003
Print