88 chevy s10 hesistation/stall

I have an 88 Chevy S10 4Cy Standard tranny with about 198,000 miles on it. While driving to work it started hesitating real bad and did not seem to have much power as i put the gas to the floor. I got back home and after turning it off, it won't start back up. I checked for spark (and all of the plugs spark fine). It's getting gas to the engine (I see it come out of the injector and into the throttle body). I changed the fuel filter and still it won't start. Any suggestions on what it could be? Thanks.