My Supra started to vapor lock last year after 3 years of running great. The dealer told me to put in a new fuel filter because the Ethanol was breaking down the filter and restricting the fuel flow. Less fuel in the fuel pump made it easy to vapor lock. I changed out the filter and have not had any problems since. But, now I always carry a squirt bottle to spray the fuel pump just in case! Hope that's all it is.

Scott