need help urgent with loss of power

[TUNES]

hey everyone, i just recently had the rocker cover gasket done as it was leaking and everything was fine so i took it over the jet wash a few days later to clean the oil up a bit that was everywhere and burning and causing smell inside the car

everything cleaned up nice and i left engine running while doing it................i now have no boost at all

car runs and drives smooth just has no boost pull at all

had AA out and he couldn't find anything run and said couldn't hear any vac leaks and no fault codes were showing

i have disconnected the maf and drove it, no change

now....if i leave engine running a while and then drive i have normalish boost for about a minute and then nothing


if anyone at all has any ideas i would be soooooo grateful as its pulling my hair out