When I changed the plugs the ones I took off were champions I believe but definitely not the same brand I put on I’ll check that out I was told earlier in the thread about an insulator if that doesn’t work I’ll have to seeThat's what I was running. I just bought what the sticker under the hood said, because everyone says these rigs love OEM parts. I haven't had a CEL in several hundred miles since switching to Autolite iridiums. XP985, if I recall.
Before, it wouldn't make it half a tank.