My late 91 developed a miss on a long trip last Sunday night, The miss comes and goes. Temp seams to have nothing to do with it. but I did crack each injector line today and each cylinder was contributing, and at the time the truck was not missing. I am leaning on an injector fouling up, I will change fuel filter also. I called Cummins, they want 85 pr injector for stock only, another local diesel shop wanted 500 for a set of 85-100 horse up grade injectors witch seamed a bit overkill. I will look into piers, what do yall think of the 195's or the pod's? Thanks Jon