Quote: I think it goes back to the previous step, if you don't have all "juice" in on the primary winding in the coil...you don't get all juice out from the secondary winding to the spark plugs. I would still look for the reason why you have that low 11.something volts in to ballast resistor and corresponding low voltage (= low current = low energy = weak spark) to the coil.
The 11.something reading was with the engine OFF. With the motor running, the reading on the blue wire of the ballast is 14+V.
Quote: Don't think you use a ballast resisitor with a MSD coil. Check the instrutions.
I will read the instructions but I have run this exact coil for a LONG time with ballast and no issues like this. Maybe I could ditch it but I don't think it is necessary to run without one. If this had been the case from day one, I'd agree with you but this problem began with a perfectly running car. I even had it dynoed with this exact same setup before this began...
