Fuel and ignition revamping (solved?)

MomsDuster said

I will check into that. The coil is powered by the MSD box and the box is wired directly to the battery. I suppose there could be a voltage drop to some degree. Although according to my gauges I haven’t seen anything under 13v. But I will definitely check.

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I've seen some strange stuff in the past. A drop from the dash to the battery could be enough.. It's hard to say without knowing how your alternator wiring and voltage gauge is setup, but it's always a good thing to check. Low volts causes so many headaches that can be tough to trace..

Interference can be possible too. It would definitely be there at all revs, but minor changes are most notable at idle, so you just may not feel it elsewhere.

Both are longshots versus simple increased load from the alt, but worth investigating if you can.