I have had a problem with engine being difficult to start after refueling recently. First time was after long day with lots of idle time on engine. Stopped to fill up. Then engine took 5 times before starting up then idling very rough for a bit. Second time had been on road for an hour. Same problem but longer to start. Then about 30 minutes down the road it stalled when stopped at traffic light. Restarted on 4th attempt. Now runs fine but have not refueled. Anybody having this problem? Only got 23,000 miles on this gas engine.