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You want to remove the ICp sensor from the passenger side valve cover. Apply compressed air and listen for a leak.
If that is the case you want to remove the pasnger valve cover and reinstall the air test fitting.
If you have the ability to apply the ipr valve you can. Either way the valve cover will need to be removed so you can see where the air is leaking from.
That would indicate the ipr is working correctly. Can you please remind me of all the parts you replaced recently?
The vehicle only doesn't start when hot correct?
Ok if there is no leak in the high pressure oil system we might need to look elsewhere. Do you have a scan tool to monitor data?