Ok so i start my aeb b5 audi and sometimes there is this clicking noise and some times not... the engine has lucus oil treatment and 5w 50 synthetic oil in it...you know to hide the noise xD lol ... thats all fine a guess seeing its been doing this noise thing and still runs...? will it be ok ???? also my ac makes this sqeeky noise when its on sound like its under the drivers side rear seat also were my side pipe comes out... it sqeeks less when the ac is off but still sqeeks ... and RIGHT after u turn the ac off it stops all together then comes back -_-... and finaly my rpms shift from around 400-900 when ac is on and if i press the gas and let go it almost stalls out into the deadly 300 rpm range. when ac is off it wont almost stall when i let off gas but it will still fluctuate ...IF YOU CAN ANSWER ANY OF MY ISSUES PLEASE DO.... id greatly appriciate help=)