e30

Car has great torque and power, I am noticing some stuttering throughout the revs, no misfire codes are pulled but that’s the best description of what it feels like. I went ahead and have ordered 2 step colder plugs to see if that can address the issue. The stuttering is intermittent on WOT and doesn’t seems to increase as the revs go up. Occasionally I will experience a CEL with Over Boost Code 30FE and 3100, car goes into limp mode and must reset codes. 2x 3rd Gear Pulls and 1x 4th Gear Pull

I finally got the electrical issues sorted and got a pull in went from 4th 2500 to redline car felt very linear feels very fast on lower gears please advise if any changes need to be made on my end thank you