So, we have a 03 6.0 powerstroke. We got into the motor to change the fuel injectors and glo plugs. We got the truck from and idiot so who knows what could be wrong. But the motor ran before we started taking it apart it was just misfiring, lots of black smoke and a blue haze at idle sometimes. So obviously we knew it needed glo plugs and injectors. But upon pulling the glo plugs, we found that 2 of them on the right side (first two we pulled) had a decent amount of oil on them. I was reading on a forum that 6.0s have a little bit of oil in the heads all the time and its not really unusual. But I'm suspect that we could have a bad motor, head gasket, maybe a ring or piston? Does anybody have any suggestions on what my issue may be ?