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A few things;
1. Make sure the purple and green trigger wires are not reversed. Switch them and see if it doesn't fix the problem.
2. The unswitched 12 volt lead needs to be a home-run to the battery. Don't go to the starter or rear fuse panel. The MSD can pull over 20 amps. make sure your wire size is big enough (#8).
3. The switched 12 volt wire needs a good supply and make sure it's constant. I had trouble with all switched sources and ran a dedicated wire with a switch on the dash. Don't forget to turn it on if this is the route you choose.
4. Make sure you cut the appropriate wire for six cylinder use. There is a cover on the MSD box that when removed exposes a number of colored wires. Check the MSD instructions on which one to cut.
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Tell it like it is or don't tell it at all.
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