Need some advice Ihave a 03 AudiA-4 1.8T check engine light on & car runs veryrough at idle.I retrieved these trouble codes p0300,0302,0303,0301 & p0171. Any Info on what might be the problem? Thanks

Misfires on cylinders 1,2 and 3, also
lean running. Look for vacuum leaks and
replace the spark plugs. Reset the codes.

__________________
2001 A4 1.8T Q Casablanca White, Tip, ESP, Xenon and Premium

i have the same code po306 on my 4.2 but i don't know which cyl. is #6- anyone?