Drove less than a mile to get gas. I had not driven the M3W in two days. Put gas in, did not even come close to over filling, shut the cap and went into the store to buy a paper. Came out minutes later and saw gas dripping rather fast from in front of the rear tire. Large enough spot that it was as wide as the vehicle. Moved it forward, started up, went about 60 feet and experienced the worst vapor lock or rough engine I have ever had. After 60-90 seconds I got enough power to run although it sputtered for the next half mile. 2 miles later running smooth, pulled over and no drip, none since. Any ideas or just another M3W experience?