2018 Buick Encore. First winter of owning the car At around 20,000 miles the PCV froze. Dealer repaired under warranty and installed updated parts. Since then has had intermittent slow to accelerate issue when cold. Have put on about 40,000 miles since then. Now it does it warm once in a while. Dealer says there is no issues as it has no codes. I have not dug into it yet. I was wondering if anyone had any in-site into this issue that may be helpful. I am a diesel mechanic and know very little about this engine. I was hoping someone would have some useful information before it tore into it.