Tahoe, you got to get rid of that battery. I had one short out at speed on the four lane with boat in tow. felt like someone dropped the anchor. that was after spending two weeks telling myself that the intermitten miss in the SUV couldn't be the battery because each time it wonderously corrected itself, I had good voltage. The cells are shorting out due to 8 years of deposits from all those charge cycles. (mine was 8 years old). Also I don't think the variation you are noticing in your dizzy can be causing loss of voltage.