Coilpacks?
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The Best V8 Stories One Small Block at Time
They have a high failure rate. I had them on my car for 4 months. Many instances of P0300 codes. Finaly major misfire on multiple cylinders. Sent them back to MSD under RGA and 4 were replaced. 3 dead and 1 low output.
When I got the set back I was foolish enough to put them on again. After one drive my motor started to misfire again. Many people are experienceing failures. Stay away. I plan to put my stock coils back on and then chuck all 8 into the dumpster. $600 waist of money.

