95 Mazda low RPM hesitation/miss

My daughter has a 95 Protege with 122k. Recently it abruptly began to “cut out” whenever under load at low RPM (under 3000). Installed new plugs, wires, dist cap, and ran some Techron thru gas. It’s better, but still hesitates if I try to “hurry” it–slow acceleration is OK, and once it’s above 3000, it’s great. Coil? Fuel contamination? Still dirty injectors? Any ideas would be appreciated. Thanks.