Hi iv got a problem whit my b4 leggy she 2L twin turbo auto tiptronic my problem is when im crusing in 4th gear top gear at around 3000rpm when i slightly press the accelorater a check engine light comes on and when i take my foot off the pedal the light goes out she goes down in power a small bit when the light is on i pluged her in and the fault that came up was airflow metter iv changed it and light is still comming up has or does anyone know what is wrong oh and its totaly standerd no induction kit just an sti exhaust