I have a 96 6.5 and its acted like it was missing and smoking a lot when first started after setting all night. It varys from sounding like missing and smoking from a few seconds till lately it might last as much as 45-50 seconds. Then it runs fine and no more smoke. I've checked glow plugs, glow plug relay tried a couple different pmd's 3 different ecm's and nothing changes its problem. And by the way glow plug and relay checked ok but I installed new plugs anyway and put a relay off a truck that was starting fine with no improvement. The only codes ever set were fuel response to long and to short but most of time it sets no codes. The injection pump, ecm and throtle pedal were all put on new less than 5k ago. Is there anything obvious that I'm missing? What else could it be?