It has one bad glow plug in it (broke in the head). If it sits overnight and for maybe about 8 hours in 35 degrees or less, it is damn near impossible to start without needing to throw a jump box on it. Is the one bad glow plug enough to throw it off this bad? I ordered a block heater cord for it. This is the first year in PA I’ve ever had an issue starting it and I’ve been running it off 5 plugs for about 3 years. 227k miles, running Lubromolly synthetic oil 10w40 (mb spec sheet approved).