02 7.3L w/66K miles. The other day while I was driving the low fuel alarm sounded and the fuel gauge went to empty (3/4 tank of fuel). I stopped and shut the truck off/restarted it and it went back to normal. 1/2 mile down the road it did it again. Restarted it and it has been fine ever since ..... until today. Started the truck fine...while warming up it started to run a little rough, I went to leave the driveway and it ran really rough and blue smoke out exhaust bad. I shut it off and restarted it. It smoked bad and idled really rough. Drained the filter and tried again. It barely wanted to start. Still runs very rough?? Wants to die!!! Any thoughts????? CPS changed already. Fuel filter changed at 50K. Can't drive it.