1999 Plymouth Breeze Shuts down

I have a 99 Plymouth Breeze. I just bought it uses.
It runs perfect for a while. After it gets up to running temp. Every 3 to 4 min is just shuts down. It may or may not buck once or twice, like it isn't getting gas, then completely dies. As soon as I turn off the key wait about 30 second, it starts right back up as if nothing was wrong and runs perfect for another 3-5 minutes then does the whole thing over again. I replace the upstream O2 sensor and the fuel filter. It still does it. If I disconnect the O2 sensor it runs fine without any problems. It is not showing any codes until I run without the O2 sensor connected then I only get the code for the sensor not working