Hi, I bought the ez tcu and I am using it on a 4l80e with carb. It is wired per the directions, the tps signal is reading right and all my connections are good. When just the switch is on for the transmission controller the light is solidt, when I turn the ignition on it stays the same, as soon as I start it the light becomes becomes intermittent with comm error appearing. The 12v is ran to a separate switch. .