1991 Acclaim-stalling, starting, lurching--intermittently

RE: Plymouth Acclaim 1991, 4 cylinder. 75,000 miles. I am a new user. My husband is a mechanic and has been trying to fix this car for the past 6 months. The problems are all intermittent. At times, it will lurch when stopped at a light. At times, it will stall while going down the road. After stalling, it will usually not start for a designated period of time (not yet determined. At least 5 min, sometimes longer) occasionally it will start right back up. Other times it runs fine but if asked to start back up once driven before it sits for a designated period of time it will not start right away. It cranks but will not start--then when it does start, it acts like nothing is wrong. My husband says it gets no spark when this is happening and he has replaced the ignition module. Incidentally, since replacing the ignition module, knock on wood, the stalling problem seems to have ceased. However, the lurching (occasionally) and the problems with restarting after only a short period of time continue. We are pretty sure it is in the ignition, but would like any suggestions you may have. If it matters at all, the timing belt was replaced on this car prior to all the above symptoms starting.