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If it's running like crap, that's most likely the EGR not working properly. If you somehow cracked the porcelain on the plug or the wire was damaged or not on all the way it could cause the miss. The Seafoam may have caused some carbon to break loose and got lodged in the EGR, who knows.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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