I'm helping a neighbor girl that bought a 02 Stratus with a 3.0 and the used car dealer she bought the car from adjusted the idle on the car higher to stop the car from stalling. So, me and another neighbor took the car and cleaned the throttle body & ISC or (IAC) and now the car runs good and doesn't stall, but I don't know what the mechanic used to adjust the idle. I did see a screw on the top of the throttle body, but I didn't want to start turning stuff. Any suggestions? Thanks in advance for your help you guys have always been a huge help.

Trevor