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elwood,
I don't think its vapor lock. That would be evident whether you stopped or not, and the car would buck because its encountering a lack of fuel while driving.
I suspect the problem is in the ignition wiring, relay wiring - which is not used during engine running, just startup. From your testing above its sounds like the heat is affecting the function of a relay or circuit that powers the fuel pump. If you have a book w/schematics, I suggest tracing the circuit from the fuel pump back to ignition - checking voltage, impedence, and grounds.
Enjoy!
__________________
Gerard
74-914 White - Soon to be a custom 3.2L Six  87-924S 2.5L Artic White - SOLD  74-914 2.0L Ravenna Green - SOLD
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