How do you adjust revs on a 2004 lancer?

To adjust the revs on a 2004 Mitsubishi Lancer, you'll typically need to modify the idle speed through the throttle body or the idle air control valve (IACV). Start by locating the throttle body and checking for an adjustment screw, which can be turned to increase or decrease idle RPMs. If the IACV is responsible for idle control, cleaning it or replacing it may help if the idle is unstable. Always consult the vehicle's service manual for specific procedures and specifications.