hi guys.....
I had my car revoed last week and for the first 3 days it was running just how i wanted i was completley happy with it?

now?

it feels like its gone back to factory settings
can it do this?? has anyone ever had the same problem
its also running badly again just like it was before i changed the mass air flow censor which was only 5 weeks ago can this have gone already???
i would be greatfull for any help before i go back to my local dealer and start? kicking off

1999 satin silver 1.8t