These engines are a pain and riddled with sensors. I get a p04db code, (crank case ventilation disconnected) when my truck shifts into second and I’m pulling a load ever since I upped my tire size since my transmission clutch values think I’m still turning 32’s when I’m really turning 35’s so the engine lightly lugs and trips it. That’s the same code everyone gets when they have tried catch cans. I think one fellow had luck rigging 2-3 different systems together to make a catch can work but he has since passed on.