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Chris, if you buy a Bosch O2 3-wire sensor, then it's a sure thing. You won't have any problems.
But, I would not suspect the O2 sensor in flat spot or throttle response problem. When you disconnect the O2 sensor (the sensor circuit, not the heater circuit), the voltage to the dme from the O2 sensor will be cut off. This will cause the system to run in "open loop", or in other words, the dme computer will go into a safety mode of pre-determined ignition advance and fuel injector timing, based on temperature and throttle position. This will not fix your problem unless your dme chip image for closed loop running is damaged (not likely).
I would suspect fuel delivery pressure, or maybe a plugged cat or a muffler baffle that has come loose and is blocking the exhaust gas outlet.
Here's what I would do. Warm the car, then open the oil fill cap. The engine should stumble, then recover. Replace the cap, then disconnect the small vacuum line to the fuel pressure regulator. Should stumble then recover. The second test is the rich stop test. If there is no change in idle, then I would connect a fuel pressure gauge and test the pressure both running, and with the dme socket jumpered (engine not running). The do a fuel delivery test (volume of gas over pre-determined amount of time). All of this is covered in the Bentley manual.
If these tests show no problem, then I'd remove the cat and shine a strong flashlight in there. You should see faint light. If the tests show low pressure, then you can try running some Techron or some BG 44K in the gas tank with fresh clean Premium gas. Or you might have to replace the fuel pump, depending on how bad the pressure is or how bad the engine stumbles.
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