Im wondering if the Triple pulse on the MSD cuts out and goes to a single pulse at the spark plug, at the higher rpms,,, they say thats what they do,,, So, I can see it throwing the timing way off, and maybe cut out and act up. MSD does smooth out the engine at idle, gives it a better flame front and can allow for better base timing setings too,,, Good example of this is a points distributor, then add electronic IGN, then add a MSD,, see if your idle speed increases and sounds alot smoother. If you had HEI, Im surprized you did not set the dizzy on fire!!! LOL!! Just an accel coil burned mine up one night in less than 20 minutes, and 10 miles from home,,, glad I kept the old cap/coil with me. I had one on my 50 IH H,, mainly used it to knock a couple of HP out to get my tires dialed in with my motor,, but when the battery got low,, I knew I could turn that dial, and it would crank right over, then set it back to my marked position. it was a fun device, I used it while pulling, got some bad looks,, but it helped me go a bit further when used like that,,, ChadS
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