Have a 94 6.5TD 3/4 ton Suburban and its been great til recently. Has 205000 miles on it. Recently it was hard to start when it was cold or hot intermittently and would "miss" as you're driving. Had the Fuel driver replaced and now it starts great but the "miss" is still there intermittently. Sometimes it'll miss just driving at a constant speed other times under acceleration sometimes not at all. I do notice that when I start it in the morning it runs a little rough with black smoke for about a minute or until you step on the pedal once or twice. Had the fuel pump replaced, injectors tested, oil switch tested and the lift pump tested - all were Ok Any ideas? Terry 602 373 2530