How long have you owned your evo? what are your diving habbits? What kind of modifications are done to your car? have you had drivetrain work done on it? i have an 05 evo with acd and havent had any problems with it and i havent read about much problems. If the acd problem has been going on for more than a year i'd say take it to your local mitsu dealer to have it diagnosed before it gets worse. as for the noise, my car makes a slight bearing type noise under light throttle but and also goes away under acceleration and when i let off the gas, i've had my car for two and half years and its almost stock and has always made that noise without problems and has not gotten any worse, with the 4wd system its normal to hear some whine and drivetrain noise, but if it does get worse/louder its best to get it checked by the dealer or a tuner who works on evos. hope this was of some help
