2017 crank no start unless gas cap is off and purge valve under hood is bypassed

Have you solved your issue? I am experiencing similar issues. However I have been thinking my valve cover gasket may be the culprit for my air leak. Also truck refuses to stay running unless I remove my gas cap, then It will idle, roughly though. If I put it in gear it will stall when lightly on the gas, tells me there is an air leak past mass air sensor since that reads 0.01. Frustrated as It all started with a crank no start, and no codes so replaced fuel pump, (same crank no start issue),replaced pvc valve, and maf sensor, aswell as fuel pressure regulator. Have been away from home for a couple weeks since truck is on a dirt road one county over and would like to get this fixed and back home for Christmas. Any help / advise is greatly welcome and appreciated!!
Truck has 217,562 miles and it is a 2017 sr5 with 38 gallon tank so charcoal canister and purge valve are different than the 26 gallon tank. also experiencing multiple cylinder misfires now that it’s idling with gas cap off, weird to me it runs with it off better than on… and the misfires for the cylinders is new, was running beautifully with no timing issues.