Hoping that someone can help me figure out what is wrong. My 99.5 A4 has a rough idle when the a/c is turned on but seems fine when I turn it off. I had the coil packs changed last year so it should not be that. Also had plugs changed at the same time. I had the turbo replaced earlier this year still a ko3not sure how this would effect the idle though. Any help would be great.