So I've been posting and tackling this for quite some time, and my mechanic is saying he's not too sure either.
I have 2016 M2 with the following mods:
• AA Catted DP
• CSF FMIC
• FTP Charge Pipe
• TurboSmart Diverter Valve
• BM3 OTS Stage 2 93oct
So this all started when I changed out the spark plugs and ignition coils. The car was stalling right after starting up or it would shake and struggle at idle, feeling like it's on the verge of stalling. (All of this happens when the cars already warmed up, and you start the car)
I took it to my mechanic, and he sort of resolved it by switched the plugs out for new NGK's, and so far it only stalled twice, but it's always shaking and struggling for about 5-8 seconds, especially if the car starts when the A/C fan is off, and then it seems fine.
Sometimes, when I start the car, the RPM's will also spike up out of nowhere, and then settle back down. Very quickly. No codes at all.
Here are a couple videos of the start ups. It may be hard to hear but it really does start up and then settle down almost as if it's on the verge of stalling.
Anyone have any idea what's going on? I may put the old ignition coils back on to see if that was the issue. Other than that, I'm thinking about MAF sensor, MAP sensor, O2 sensor, DP, HPFP, Fuel Injectors, or possibly even Valve Cover Gasket.
https://youtube.com/shorts/iR21Gjqjir4?feature=share
https://youtube.com/shorts/mSUmLUGGLX8?feature=share
https://youtube.com/shorts/YDgRwD4YRmI?feature=share
https://youtube.com/shorts/B6QMPuaOKYo?feature=share