first id like to start by saying i goofed .. i thought i had to remove the resistor from the top end of the plug .. when u actually can just unplug the top half of the plug .. i removed it and got some bad pinging ... so i replaced it .. pinging gone ..i also was running 87 octane so it was kinda expected .. i went to radio shack and bought a adjustable pot .. ill post back on the measurement that works for me and 87 octane