Think timing belt is shot. Need confirm before buying parts (yeah I can fix it)

Thank God for you answering .. so the timing belt thing is fine. I took it apart and it's at least in one piece. That said, I keep thinking back to the 1-2 hours prior to it dying. I had that REALLY LOUD SCRAPING sound like I was dragging a huge pile of metal around for about 20 seconds.... just prior to that it bogged down (going 75mph) like there was water in fuel line (or sumin like that) I'm in dire straights here. I was reading where it might be IAC? Problem with that is I wouldn't even know what to do with it if I found it. Again... I can fix anything if I Google (and harass unsuspecting forum folks like yourself). I'm a nurse practitioner so this is far from my forte....... Lol Oh yeah.... code came up 02 sensor awhile back but those were replaced. Any help at this point is very very very very much appreciated. Thanks so much again!