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Maybe a rich condition caused by the EVAP system? You could try blowing out or even disconnecting the EVAP purge valve, plugging both ends and see if that helps.
I'm thinking that if you had a bad valve in the EVAP system that fumes could be flooding the intake, same as the "hard start when hot" issue. After sitting for an extended period, the fumes would dissipate and the problem doesn't occur.
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