I changed the the plugs and put in what I thought were the right ones WELL>.. the autoshop gave me the wrong plugs and I buy stuff steady (they have never screwed up before so I never looked before I installed em.) from them so I never checked,,,they were R44S.. LOL no wonder it hated starting in the minus 20 we have had.. the bosch platinum started the truck in minus
30 and the thing was rolling super slow.. think it solved the problem...