[Suby Fan]

it sounds like you have ether a issue with your evaporate emissions system or your your fuel pressure regulator.. you should check fuel pressure and flow (i don't think there is a spec for flow if you need i can look up a general one) and check codes as well even if the check engine light is not on.

and to clarify vapor lock is when the fuel heats up in the lines around the engine enough to turn it to vapor causing the car to stall because the fuel pump cant pump air.. its alot more common on old cars due to the fact that fuel pressure was like 5 p.s.i not 30+ like todays.