340 Engine Shake

512Stroker said

I dont know what ignition you are running but, I killed a new MSD box pulling plug wires.

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I have MSD pro billet dist (mechanical advance locked out for efi timing) and an MSD EFI 6 box. I don't think I am going to pull the wires. I put the timing light on each wire and temped the tubes, so I don't THINK I have a dead cylinder.