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after driving a bit when weather is hot it drops a lot of power, chokes, bucks badly on 1990 Ford F-350

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1990 Ford F350 w/ 460 Fuel injected engine. after driving a bit when weather is hot it drops a lot of power, chokes, bucks badly. the fuel filter is new. there is no catalytic converter & there are no vacuum leaks. very frustrating please help?
(3) Answers
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first thing i would try is a fuel filter. if that does not work, have the fuel pressure checked.

Roy
Also check for vacuum leaks!
We all ready done this to the truck and it is still choking we checked fuel pressure check check vacuum leaks
My F350 1994 pretty much poops out above a 100 degrees. It is a vacuum lock in the fuel line I am sure because as soon as the weather cools down a bit it works fine. I was told that a "fin" could be installed around the fuel line prior to entering the carburetor to help keep it cool,but have not tried it.