NHTSA Complaint #11460574 — 2014 KIA SOUL

March of 2021 I started to experience slow take off speeds also the car was riding a little rougher than usual when accelerating with engine light on. I took it to the Kia dealership when they advised me that my catalytic converter went out and had messed up entire exhaust system which they ended replacing which cost me $1800. September I noticed car was ONCE again riding rough with the engine light randomly coming on and going off, I figured maybe I needed an oil change because I was close to the mileage listed. THey advised me that my oil was really low and I should keep an eye on it. November I was trying to accelerate and the car was hesitant at this time my engine light was on while experiencing the issue. Took it back to the dealership they told me my catalytic converter was dirty and they cleaned it out which should fix the issue and my cars oil was once agin dangerously low, which they topped off because it wasn't time for an oil change. Mid december I went back to the dealership because my car was not accelerating properly and engine light was back on. They told me I had NO oil in my car at all, and my engine was not processing oil correctly, I would eventually need a new engine but as long as I kept oil in my vehicle it would operate correctly. While leaving the dealership it seemed to accelerate slightly better than before. I was able to hit 50 mph without an issue while riding in the middle lane my car started to quickly decelerate while my foot was on the gas pedal, I had to immediately move to the shoulder in the middle of traffic I almost was hit seeing that I was decelerating at such a fast pace.My engine light was on and solid when this happened I was able to merge to the shoulder without being hit or hitting someone.Turned the car off and started it back up attempted to get home car will not go past 25 mph. Car is currently not able to be driven safely