Catalytic converter, egr valve, oxygen sensors. If you have that many miles on it, try loosening the exhaust before the cat converter and try driving it. If your power has come back, then it has failed internally.
SOURCE: 1998 Cavalier 2.4 L stumbles and misses at 2000-2500 RPM
Vacuume Leaks can cause this problems. you have to do a through check of vacuum hoses and the EGR valve. Your best bet can be to have your vehicle scanned at an autozone store and get a code. The EGR has to be closed at idle, then as the engine warms up or is accelerated, the EGR opens. That is if your car does not have an electronic EGR . The electronic EGRs do not use vacuum to operate. They are controlled by the PCM (power train control Module).
SOURCE: 98 Cavalier 2.4L engine stumbles at 2000-2500 rpm
Could be a short in the wiring for the O2 sensor. I currently have the same issue only my car finally threw a code after two days of it acting up. Code 106. Changed the MAP sensor and it now throws 108, MAP sensor high voltage circuit. Ah the joys of cold weather and broke down vehicles. But I know that you wont always get a code with a short. Let me know if you fixed the problem.
SOURCE: '07 Tahoe; check engine light on steady. Just came
Have a dealer or garage check your Oxygen (O2) sensor. As a quick fix, try disconnecting and reconnecting your car battery. Sometimes this will reset the check engine light.Good Luck!
SOURCE: 1993 Chevy S10 Blazer engine hesitation with smoke from exhaust
Had a 94 Olds Bravada that did a similar thing and it was EGR valve on the front of the intake. It' s easy to take off and clean with WD 40 and if you have an air compressor blow it out good.
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