1990 2+2 with TT swap. This is whats going on. Replaced the brake booster about 2 weeks ago and after everything was put back together this started happening. It never happens when the car is cold. When it gets to operating temp is when it starts to do this. I cant get it to stop and I have tried about everything but cant come up with a solution. Thought it was the alternator but I checked the voltage and its sitting at the right level. Can someone shed some light?

1st video idleing

2nd video - driving