My 2006 Tank Urban Racer has 2 problems. One seems to a fuel issue in that there are times that it won´t start and there are times that while driving, it will just die out and won´t restart until it sits for a few minutes then it will run about a block and die out again. Fuel filter has been replaced and no fuel leaks. Second issue is that it will occasionally keep running when key is turned off. This does not happen all the time. To get it to shut off, I have to jump up and down on the seat. I assume it is some type of short but can´t locate and it doesn´t happen all the time. Any ideas on these problems?