It is bogging down and sometimes quits when I step on the gas

The code is 121 low throttle position, how will my car run?

That code may be indicating that there's a problem with the Throttle Position Sensor. I'm skeptical, however, the TPS is the real issue. Your problem may be a more garden-variety problem, where the Ignition Control Module (ICM) and coil need replacing:

https://www.askmehelpdesk.com/cars-t...tml#post265896

I would replace the ICM and coil, if you have 120,000 miles or more on the car. Your symptoms are characteristic of a failing ICM and coil.