Misfire & smoke on the exhaust side

[Riba]

This morning engine had trouble starting up and I could feel that some cylinders were not firing. I went on to drop of my kid to a daycare 5 minutes away and deal with it later. On one of the traffic signals I noticed smoke coming from under the hood so I pulled over and popped the hood open. Engine was still running erratically and at the same time there was white smoke coming out from the engine right side (where the exhaust is). I believe it was burnt oil judging from the smell. I dropped off my son, and decided to find the closest shop that can check it out, but after starting the car it was again running smoothly like nothing happened. No smoke either.

I also wanted to mention the high oil consumption but reading through other threads it appears it is "normal". It is worth mentioning that we finally has some decent rainfall overnight. Car is on covered parking but I am thinking that the moisture might have caused an electrical issue and misfire. I will check spark plugs and wiring, but what is puzzling me is the smoke coming out from the exhaust side.

CCV was replaced 2 years ago but I think i will give that CCV mod that seems popular a chance:

https://xoutpost.com/bmw-sav-forums/...-problems.html

Any thoughts about this? Where is the smoke coming from and would clogged CCV cause this? I suspect it would be smoking from the other side of engine if that was the case. Why did it go away just by itself, or was it just a symptom of misfiring cylinders? Any comment is welcome, I would like to keep it on the road for another year if possible.

It is a 3.0i engine with 250000 km on the clock.

Thanks!