83 xs650 -- Its happened about three times in past few months driving along bikes starts to stall I give it gas and seems to help but then soon as I let off the gas the bike just dies and takes about 15 to 20 kicks to get it started. Seems like its running out of gas but there is gas in the tank. Once I get it restarted it runs fine.. otherwise the bike runs great except for this issue that happens randomly. ANy thoughts on what it can possibly be?