I think this happened to me finally a day or 2 ago. No start, just a stumble, no CEL or anything. Second try gave it a good mash on the go pedal which actually started, but VERY rough and died as soon as I released the pedal too far. I didnt have the time and inclination to leave it alone at that point so went for a 3rd try, stayed on the fuel to keep it going.....very rough, lots of steam, but after a few mins it could at least idle on its own again although not smoothly. Gave it another couple mins to a point I felt I could try moving the car without instantly killing it, and after a mile or 2 was running fine and back to normal. Odd thing is MPG is up a few since as well.