my 07 Vulcan is garage kept. I rode her home and topped off the tank at a station 1 mile from house. Went to start up the next day and bike began missfiring, would not idle, and exhaust smelled similar to kerosene. I siphoned the fuel from the tank and added 2 gallons fresh 93 octane with some staybil fuel treatment. After a few cranks she started and I rode her a few miles and thought the problem was solved. Next day she wont even start up! I drained the tank again and added some seafoam. no dice. I checked the spark plugs and they appear ok. I have less than 6000 miles on this bike and it has run great up until now. Can I do anything else to troubleshoot before I give up and head for the dealership?