I would assume that the lockoff is not clogged since it opens and allows fuel during the "starter cranking phase", and that as soon as power is removed from the "starter cranking phase", power is also removed from the lockoff, and as soon as the fuel that had entered the system was burned off the unit shuts down. I do not expect it to be actually the ECM, as it is only doing what it is programed to do if some other failure happens. I would agree with Lance that the wires to or the accel sensor itself being out of specs would cause the ECM to shut off fuel to prevent a "run away" condition. check the voltage and adjust the accel and throttle sensors, and/or get the program and hook up a computer to see the faults. there are other methods to get to see the faults in a spectrum system, but by far the easiest (I think) is with the proper computer program.