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Q: Does not start after car heat up (after running ac on) on 1992 Chevrolet Caprice

whenever I switch off my car after running with AC on (means heat shows 50%) does not start. It simply cranks up but does not start. If I wait for a about 3-4 hours everything works fine. What stops the start, is it the fuel pump?
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I have exactly the same problem with my caprice 2006 LTZ, did computer scan but couldn't find any solution. Please if you found any solution, share with me.

Thanks :)
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