Lose the MSD coils, I had a set and they gave me problems too. MSD makes good stuff for lots of applications, but the LS coils are junk. And they're expensive junk. Can you see if any of the coils(the plastic case) are starting to separate? That is usually what happens. I wouldn't troubleshoot too much farther until you swap them out first.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
Last edited by JL8Jeff; 04-14-2009 at 03:24 PM.
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