I finally replaced the vacuum hose to the FPR and after I started the car and it seemed to be running as usual. The idle was a little lower but the car seemed to be running as well as usual. Came back 20 minutes later to go drive somewhere and it started immediately and sounded like a Harley. Exhaust was clearly louder than usual with a pronounced popping..drove around the block once and when I put it in park the CHECK ENGINE light came on. Again, did absolutely nothing from when I shut the car down after changing the FPR (and it was fine) to when the problem occurred. Visually inspected everything and nothing looked unusual, anyone have any idea what the hell is goin on?
Oh, and duh the code was 1222 (lambda control 1). I think that's either related to o2 or vacuum leaks...going to check to see if I knocked a vacuum hose loose somewhere when I was feeling around the intake manifold.