Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum banner

po300

  1. PO300 code

    Engine Tunes/Mods
    Hi everyone. First I want to thank all of you for this helpful site; I’ve been saving so much time and money with your help. Two months ago, I got a permanent Check Engine light on, PO300 “Random Misfire” with a poor idle; after reviewed some of your posts, I cleaned my throttle body, change my...
Top