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Q: 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?
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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.
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