[LongBox]

Sounds good. Idling nicely, and you did not have to go into the engine. As for the low compression, the engine should run for many miles with one cylinder low, but it will never be quite as smooth as an engine with equal compression across all cylinders. Will not develop as much ultimate power, either, but probably not worth going into the engine until something else needs attention, and that could be many miles down the road.

If you are interested in further diagnosis of this problem, you could do a "wet" compression test in that cylinder. If you add a couple of squirts of engine oil through the plug opening, you can check the compression again. If it goes up significantly, it is an indication of bad compression rings. If it does not go up, it usually means a bad valve.