Rich --
I'd forgotten about this - but one time I had an errant "stumble" - but it was at any time - any place... I finally found it was one of the connections at the distributor - the "clip" on the weather pack connector wasn't clipped - it looked like it was but just wasn't quite. Once fully engaged the problem went away. Also had a bad Dual Sync one time - something with the circuit board - replaced it and have had total reliability ever since. That was very early on in the Accel EFI years (something like 8 or 9 years ago at least). They used to have too small of a wire harness coming out of them (too small and too stiff too!) but they've since changed that.
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