Today I bought a test light kit to check my fuel injection harness. It came with several noid light modules and I would rather be sure which one to use than to cause any more damage by using the wrong one. The modules in the kit are ford TBI, geo TBI, bosch PFI, gm SCPI, gm TBI and gm PFI. I hope one of these will work on my '95 cobra with SEFI. I have 2 cylinders with no power and have checked the ignition system thoroughly. The spark plugs on these 2 cylinders show no fuel deposits and I believe the injectors are not firing. I've replaced the injectors and no difference so I want to check the harness and the ECU for problems. If harness is bad where can I find one to replace it? When I bought the car it had an accel DFI system installed but the owner did not want to sell that with the car so he gave me a harness and I bought a used ECU ( the original harness was hacked to work with the accel unit and a procharger). Any help would be greatly appreciated! ALSO is there any way to check my ecu besides replacing it?