this truck has a miss on startup after sitting all night, only lasts for a few seconds and then runs fine. another twist to this story is, it is losing coolant slowly, not leaking, no steam out of exhaust. pulled plugs in the morning before startup and looked in cylinders, one cylinder appears to be damp inside, turned motor over and there was no coolant sitting on piston. compression test showed that cylinder about 10 lbs. lower than others. also coolant is low in radiator, never in reservoir and operator says after sitting overnite radiator still has pressure in it when he removes cap. it appears to not be pulling coolant from reservoir when it gets low. any help greatly appreciated