1998 Chevy Astro Rough engine

this is one for the ages, this van had been driving absolutely fine for over 3 months. Then all of a sudden it started with the check engine light and acted like it wasnt getting fuel. The o2 sensor, fuel filter and plugs wires, and dist. cap were replaced. Seemed fine, then a few weeks later went out to start it on a cold day and it was dead. Had guages, but no power to engine. Couldnt even crank, so jumped it seemed fine. A week later, went out and started it and drove it 30 yards to the stop sign it stopped started to spit and sputter and died. Took it in and had the mass airflow sensor and tune up done, garage couldnt seem to replicate the problem. Hooked it up to the sensor machine and said the maf sensor needed replaced and so it was. Now just recently almost a week after its cold again and drove 50 miles and, it seemed fine got out on the interstate and speed up started to spit and sputter again whats up? Any ideas would help. Thanks
Clint