Repair of a 1995 Pontiac Bonneville V-6, 3.8L SSE engine continues to quit, all other electrical A/C etc continues to run, even though no diagnostics can identify. What do you think? The vehicle has had the following, codes of po321 spark ref. lost, po705 transmission range switch error, ignition control module loosing spark & neutral safety switch to be out of range. These actions were taken by the mechanic: removed and replaced the ignition control module; removed and replaced the neutral safety switch. Yet, the engine at times quits an average of once a week. It can be restarted almost immediately. However, safety is involved with this problem. What do you think? Can someone help? [email protected]