í95 Chevy Lumina -multiple issues

Hi! I have a í95 Chevy Lumina with some weird issues. Itís got about 140,000 miles on it, but itís been a pretty good car in the 3 1/2 years Iíve owned it. Last year at inspection time, it needed front
struts. Ever since, my anti-lock light stays on. Most recently, it has started losing power and "chugging". I have no take off speed from a complete stop. I looked at the muffler, and it is actually rocking a bit as poofs of exhaust spit out. Iíve replaced spark plugs, oil and a fuel filter. These fixes helped for about 2 days each, then back to the "putt-putt-chug" that it does. When on the highway, if Iím giving gas, the "chug" gets so bad I feel like the car is going to stall out. As soon as I let off the gas, itís fine. It takes me about 50 seconds to get from zero to 15 mph, with the gas petal on the floor. Iíve tried fuel injector cleaner and the "complete system" cleaner gas additives, which improve the problem for a day or 2, then back to the frustrating chug. Any ideas what might be causing these problems?
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Any other lights on? If not, still good idea to have it scanned. And have the cat convertor checked--sounds like it is stopped up. If so, it may just be time to replace it,.or something else (as told by scan) could have caused it to stop up. If so, correct that cause AND replace cat conv. s s
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