My 28K mile 996 starts fine when cold, runs great too. If shut the car off after driving and restart, it starts again very quickly and runs fine. But when warm and let it sit for over one hour, it takes a long crank before firing up.

I ran diagnostics, and there are no trouble codes. Starter, battery, fuel pump pressure normal, so is evap canister valve. No corrosion on starter/battery cables. I think the fuel pump, crank sensor is OK too.

If anyone has further thoughts, please let me know. TIA.