ewingr, Yes, vapor lock should actually maybe, be called vapor clog.. It can be very subtle and annoying. For instance on a cooler day doing the exact same thing you might not have a problem. Or if it was a really cool night and the fuel in the tank is 10 degrees cooler, or you paraded along 3MPH faster, etc, etc. The usual solution is to execute the repair and discover you no longer have the problem.

No the hot air would not cause the problem you describe. Further when you accerate away you are running truely mind boggling amouts of air thru your system. Which means any local HOT air is consumed in a few 100 milliseconds. Your engine when consuming 200 cubic feet per minute, (about half throttle), would use all the air in your entire engine space, carb, air cleaner, radiator, grill, free space around the engine, in less than one second. SO if your problem lasts more than one second this isn't it.