I had a similar problem with my '88 TE. It occurred mostly when going around a corner. There is a cup in the tank where the fuel pump takes suction. The purpose of the cup is to keep fuel near the pickup during cornering, etc. Fuel is drawn into the cup from the rest of the tank by an eductor nozzle. The feed for the eductor nozzle is the fuel return line from the engine. On my car a small piece of a plastic baffle had broken off and lodged in front of the eductor so it could not serve it's purpose. When the fuel level dropped to the point where the eductor was required to fill the cup (the eductor is open at the top so it has no real purpose until the level gets low) the car would stall. It would restart if you let it sit a minute or so.

I removed the third seat and the floor panels. I removed the sending unit and I could see the problem. I fished the part out and the problem was solved. There are some drawings of this system on the 124 Chassis Manual.