HELP!!!!!!!
 

I recently got an evo intake and giacc software for my 2003 a4 1.8t tiptronic. after i got the crar baq about 3 hours later i got a check engine light. so i take the car back to tyrol tunning and they look at the problem on the laptop and its supposably the mass air flow so they fix that and the light goes away. the same day about 3 hrs later again the check engine light comes up AGAIN. so i bo back n they check it on the laptop and it says FUEL TRIMS: back 1 engine too LEAN. DOES ANY1 kno wat it means and has this happened to any1 what do i do they said theyll fix it once the owner comes back from vacation.