Suddenly, the car was running rough. I could drive it a block, and then I wouldn't be able to accelerate. It would work itself out and run fine. Then, it started stalling going down the road. Then I couldn't get it out of the driveway without it stalling. My mechanic replaced an oxygen sensor and that got it running again. However, I recently got a check engine light with a cat converter code. We reset it and are waiting to see if it comes back on again.