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2003 6.0 missfire on #1 and #6 need help please
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Question
cameronc
2003 2500HD 4x4 6.0 4L80e. Truck has 190K. It runs and drives great. Has great power, no smoke, doesn't use oil,nothing out of ordinary except at high rpm it throws po300 code and misfire shows on #1 and #6. Doesn't miss at idle or under acceleration. Only misses at light load above 2K rpm. I've have it on scanner several times. I've replaced plugs, wires, all 8 injectors, and swapped coil packs around with no change. All the live data looks excellent! O2's and fuel trim is right. All sensors read as they should. I can't even feel the miss when scanner says the cylinders are missing. Any ideas guys? I'm lost, I haven't even heard of cam or lifter wear on these ls engines. And it has 155 psi on #1 and 160 psi on #6 so I don't know what it can be.
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