boost problem

[smunroe2020]

hi everyone i got a 2020 3500 dually limited with a bulldog tuner. I have egr delete and dpf delete. I went from 30psi down to 20 psi at full throttle.

if I uninstall tune and reinstall it. I got 30 psi again forn3 days max. I can't figure it out . has anyone heard of this ? bulldog is not being helpful.

 

[flan]

Maybe try cleaning your map sensor. May be sooty giving bad data.