Whats Wrong?

97 Leg. Wagon 2.2 287,000 miles today while driving on my job I got a noise like a pully was going out, then it got quiet and I drove for about ninety more miles. After returning to Office I worked around two more hours then started it and went home every thing seemed fine. After I was home a while I went out to start it. It sounded bad when cranking on it then it started but would not rib up very high, and it was really raising cain from the front, and not running right. the outter pullys look fine. Iam hopeing one of the idle pullys has frozen but also fear it may be a broke or damaged cam on one side being it sounds like it is only running on two clyinders. Any Ideals? I wont be able to take it apart for a few days to look.