[eyehategod]

Originally Posted by robthewrench

Try to duplicate the issue by pressing on the brake pedal hard while idling. If the RPMs drop this will confirm that something in the brake booster is not working correctly.

If this test does make the RPMs drop, then it is not the brake booster and instead you may have a sensor issue or other vacuum leak.

This test may help:

https://www.youtube.com/watch?v=M2AnK8Q90Lo

Also here is a description of the stalling problem:

https://www.yourmechanic.com/article...-brake-booster

Thanks so much! I'm pretty sure I do have a separate vacuum line issue, I need to replace all of the vacuum lines on mine but haven't been able to find a good diagram for the N55. The only vacuum lines I've noticed on the car (I'm a noob) from working on it were the two that run off of the boost solenoid, but I'm fairly sure there are others?