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Many things do this. First you have a 84, Do a compression test. low, then give up. No matter what you sink into it, it won't get better unless you rebuild the engine. Next replace the catalytic converter. After that tune it up, from the fuel filter to the top of the engine.
The factory catalytic converters are welded in place. You can buy a replacement y pipe that has new converters or have an exhaust shop cut out the old ones and weld in new ones. Job can be difficult if exhaust has never been dropped before.
if you are not all that mechanical take it to a muffler shop they are usually cheap to cut out and swap please make sure that your current exhasut is the still stock or you will need to know the diameter of the pipe they used