At very close to 15,000 miles on my Solera, I had the same problem that I associated with some bad Diesel fuel I bought (Tom Thumb-Crestview, FL) as I was pushing on the
Engine Accelerator from a stop light. I believe I had some water in my tank that caused the hesitation. First time and last time that I have had this problem. Later on during the day on my 600+ mile trip, bought more fuel and have had no problems since.
CaptDan