full load or Idle should read the same or very close to it.you will need to make a harness so you can separate the plug from the valve,one is just an extension the other rigged up so you can place your meter in series, the line closest to you is the one that needs the junction. When the car is running the voltage should read -0 to+ 0 it will bounce back and forth constantly,Each time you adjust the 2.5 m/m allen screw,you must reset the fuel mixture at the air fuel 3m/m adjustment,It will take several times to set if it is incorrect.Take your time and be sure to count your turns and the direction of turns,even write them down very important to know incase you must go back the opposite way.NOW THIS IS VERY IMPORTANT, the 2.5 m/m that is just below the brass screw,has no NO tension on it,blow the fuel out look down in to it and see its position, place your allen wrench into it and turn it 1/8th at a time, If the voltage goes up then you will need to go in the other direction. Any other help you need you can find on one of my post on this subject.GOOD LUCK JNT