Legacy EJ25D 2.5L DOHC.
Engine began running rough and idling rough a few weeks back, CEL diagnostic codes said cylinder 1 & 3 misfire. Diagnosed with a compression test. Cylinders 1 and 3 were getting 90 and 80 psi respectively. Cylinders 2 and 4 were 190 and 180 respectively.
I just put the timing belt back on and re-checked compression on the right side. Cylinder 1 is now getting 210 psi, but Cylinder 3 is only getting 60. (Note---I did this before the engine was all back together, so I didn't idle it beforehand and the compression test was run on a cold engine.)
I'm pretty sure I got back the power I was lacking when the timing belt slipped. Just took it for a spin and it feels about the same as I recall it in terms of acceleration. So, it's possible that cylinder has been underperforming for some time...
Now that I have the results of a compression test and verified timing is like new again, is there anything further I can do without getting into expensive territory (valve work... piston rings etc.)? This is an old car (228k miles).