2000 Chevy S-10 Hey, my S-10 zr2 has lost all its power pret

Engine Mechanical problem
2000 Chevy S-10 6 cyl Four Wheel Drive Automatic

about two months ago my s10 zr2 started dying and sputtering on me randomly about 15 times a day, it made this horrible exhaust smell, and had no power when it did this, I just brought it in yesterday to a shop because my radiator cracked, so I had a new one put in. When I was driving home it started making this hissing sound from somewhere in the left side of the engine, and it also lost most all of its power, it barely goes at all. Please help me!