i was told by my grandfather that i could do it while the engine was running so i tried it and the engine started running fast so i loosened the rocker nut a 1/4 turn what i need to know is what sound to listen for and when to stop turning. ive been working on cars for a long time but i have never adjusted valves before and im scared that i might mess it up by doing it wrong
please help me thank you it is a 1987 chevy 4.3 (262) v6