My Snap-on dial timing light did the same thing to me. Setting the timing with this light would not even let the car run?? After borrowing a light and setting the timing correctly, my Snap-on light read something like 80 degrees advanced at idle. Maybe your driveability issue is caused by severely retarded timing? I was running a MSD 6AL when I had this issue. A tech that works for me also had this issue. He had the timing light pick up on cylinder #2 instead of one, lol.
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