After connecting all the sensors and actuator harnesses, replacing the coolant, and hooking up the battery, you're ready to fire it up. At this point, it's just been started, and Ken Farrell of Professional Products is adjusting the idle screw. The great thing about the Powerjection is that it senses the change in rpm, and resets the internal idle target to the adjustment you just made. That's just the opposite of what most EFI systems do, which try to take all your adjustments back out through the idle control valve. Notice the difference? You're telling the computer what to do, not the other way around.