I have a 91 rs, 3.1l. It would run for approx. 1 hour, then the tach drops, and the vehicle dies. It would re start after sitting. The final time, it refused to start. I have replaced the pickup and module in the dist., coil, ecu, all to no avail. The vehicle cranks, has voltage at the coil, but no spark. Help! Thanks, greg.,more info, and maybe a question: it appears the theft control unit sends a ground to the ecu (dark blue wire). If I were to ground that pin at the ecu, should this ground the pulse circuit in the ecu? Any help is appreciated.thanks, greg.