Reply to thread

Message: <blockquote data-quote="INW-Iron-Steel" data-source="post: 21246" data-attributes="member: 11733">How many miles on the copper plugs? FWIW, Copper plugs will actually give you a *better* spark in the beginning, but wear down faster (much faster). Platinum plugs are more of a longevity/durabilty thing so people can go 100K miles on spark plugs. Copper plugs generally need changed around 20-30K. I've run copper plugs on many gmt800 platforms with no issues, as long as the gap is within spec. Not sure about the v6, but I know GM tightened up the gap for the LS trucks after poor running/drivability complaints.Shot in the dark, but do you have a multimeter? If so, I'd recommend OHM'ing out all the spark plugs wires. I once had a brand new set of "high-performance" low resistance wires on my 04 that were crap out of the box. I was chasing a random misfire before I finally decide I needed to check the brand new wires. 7/8 were low ohm (60ish), but one had like quadruple the resistance (over 200 ohms). New set of quality OE replacement wires fixed the misfire. I OHM all plug wires when they come out of the box now...</blockquote>