New at this but I love this site A6 2.8 misfire
 

Just bought this car so I don't no to much abought the cars history. There seams to by a miss and it seams to be related to the vacuum system.Misses even more when I turn on the A/C unit.I have looked around at the vac lines but haven't seen anything. All the shops in and around Houston want atleast $100 or more just to run a scan to start to find where it'scoming from.I am going to order a service manual for this car but times are tight with work here and there. Had Auto Zone run the CEL code and got 0441, 0421,1131.I did find a flex joint on the exhaust cracked ,so it was replaced. Just trying to get to know our ride better.