2002 Jeep Wrangler Check engine light

Bought my 2002 Wrangler two days ago. Went to buy new tires and wheels. On the way home, the check engine light started blinking. Within a few seconds it was like someone shut the car off, no power. Seconds later the engine came back to life. This happened 3 times within a 1 minute period. Pulled over opened the hood and saw nothing. The engine seemed to be running on a few cylinders, really rough. Good oil pressure and not overheating. Shut it off. 10 minutes later started it and it ran fine all the way home, 50 miles. When I got home I opened the hood to find fluid all over the engine compartment. Determined it came from the power steering reservoir. Not sure if that's related. It runs fine but the check engine is still on. Not blinking. What is going on?