R55 MCS Clubman N14

Hello all, I’m a soon to be broke college students who is very worried about his car. I love it so much and I got no clue what is going on. When I start it, it hovers between 700-1100 rpm, drives OK, small misfires every 30 seconds or so. Random order of cylinders. I’ve changed the spark plugs with no change and change the order of coils. Also probably should mention this; when I apply a little force (not a lot but a decent amount to speed up), around 2000-3000 rpm’s, a very strange vacuum like hiss is present with very small crackles noises as well. Please note, I am a teenager so I’m not the brightest light in the box. If possible talk to me as if a person would communicate to a dog. If it matters, I have a Alta cold air intake, m14 intake hose to turbo, and a Amazon oil catch can.
repairs include
last week- Detroit tuned turbo oil line super kit
last month- replaced valve cover with a aluminum one from amazon
2 years ago-Timing chain

2B64 Intake manifold, unmetered air

2F8F DME: Engine switch-off time, plausibility

2783 Combustion misfires, several cylinders

I appreciate the help! Thanks in advance!

 

I've been going through the same thing until someone gave me a pointer to look at. Check all your connections. If you've messed with the temp switch and PCV connector, I found they will fit in each others socket. The connector with the Yellow and White wires should go to the temp switch. Once I switched those over and changed out my old temp switch for a new once, some of the codes you have I had, went away.
The difference you speak about is the hissing sound, so you may have a vacuum line or turbo hose that came loose. To find a vacuum leak, I generally take a can of carb cleaner and lightly spray around the motor until I hear an RPM change and focus on that area where that change occurred for a vacuum leak.
If you have a vacuum leak like it can cause many codes to be set along with the misfires for sure. So, I'd start with spraying carb cleaner and seek out a potential vacuum leak first, after verifying no loose connectors anywhere.

 

Thank you so much for the help! I’m having it smoke tested in three days, hopefully that will find my problem.