Revs up and out of control
Hello. The throttle cable (https://www.yourmechanic.com/services/throttle-control-cable-replacement) could be sticking causing the RPMs to increase excessively if the throttle cable is holding the throttle open when it shouldn’t be. There also could be a bad throttle position sensor (https://www.yourmechanic.com/services/throttle-position-sensor-replacement) or idle control...