You will need to clear the code, it cuts out the number 3 coil so it don't fire, and shuts off fuel so you can limp home ,because you were trying to drive it when temp was too hot. clear code and bleed system of any air, on top of engine. you can try a automotive decoder but will need to go to a dealer, less than 15 min. job. all those parts that were put on not causing it . Did you reprogram the gator when you install a ECU. It has to know the software . and ecu will give output signal to injectors or coil ,these are set up just like your cars and pickups, to protect the engine ,check engine light. yes the little green light is on circuit board is flashing indicating a code or codes . if no code it will be on solid.