So my SE holds its RPMS at 2k and revs up and down a few hundred. I know that my master cylinder has a leak, causing my newly installed brake caliper to not work. Any idea where to look for vacuum leaks or anything?

 

what did you just say?
are you looking for a brake fluid leak?

 

daammmmm...........Im not gonna touch this one!!!

 

buy a bicycle

 

Spray some carb cleaner around and see if the idle changes. Also, check the idle speed adjust screw. Check out the online fsm for it (look in faqs)