Rough idle

Finally got back at it today, set initial to 20*, total at 35*, all in at 3000 rpm. Drives out, and pulls very strong, still a little rough idle. I brought it back home and did compression check, all cylinders are at 125psi, except #1, it is at 110psi. I brought that cylinder up to top dead center, and filled it with 40 psi of compressed air. Air was leaking into the crankcase, I could hear it when I pulled the oil cap. Bad rings on that cylinder? I may pull, and replace it over the winter, it was plagued with low oil pressure(I believe due to cam bearings) anyway.