I've had the same issue with the dipstick popping out and replaced the o-ring to get it to stop. I also planned to replace the PCV valve at the same time, but after 3 failed attempts I still haven't been able to get it out.
I'm going to try once more with a different tool before I take the manifold off and do it the hard way. But yeah, the pressure has to go somewhere, it's best if it goes where it was designed to go.
I've also had the same issue with the idle during start-up. I've never looked into because I usually forget about it by the time I get back home lol.