I have a 1998 Elipse Gs-t Spyder and the injectors on cylinders 1 and 2 only get one pulse going to them, after that they do not get a pulse. The injectors on cylinders 3 and 4 get regular pulses. All cylinders have spark, the ECU "looks" fine, we have check the resister pack, the continuity of the wires going from the injectors to ECU, and no codes show up. The camshaft is rotating, and the belt is tight. Could their be a sensor that shuts off the injectors to two cylinders? At wits end....