2000 Subaru Legacy Cylinder 1 miss fire

Engine Performance problem
2000 Subaru Legacy 4 cyl All Wheel Drive Manual 137, 00 miles

My car will die when I slow down and let the RPM drop. The RPM will dive now to almost nothing and kill the engine. The engine light will come on and off. The read is cylinder 1 miss fire. It was running ruff for a while and fuel injecter cleaner helped. Now the engine just dies when I slow down the car.

Any help wold be appriciated. Thank you!