auto in reverse is to pump fuel into the system to overcome a lean condition when warm. This will not work by just turning the key to ignition a couple of times.
If turning the key to start with the auto in reverse works, it means that there is a lean fuel condition when warm, which could be the fuel damper.
If it doesn't work, then it is something else.
This is just a quick test to try and work out where the fault lies.

PS; This test worked with the 6.9, he was able to start the car much easier when the motor was warm.

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Bandolero
Russell Bond
'79 280 SE
'78 450 SEL 6.9