A little background... turns out the vehicle had low oil for a few week. It was starting rough but intermittently. One day the car had a really rough start and turn itself off while in park.

It's a ford focus se 2000

Since then there was an engine flush done to it as well as an oil change. The spark plugs have been replaced spark-plug cables. When connected to to ODB? connector, it says piston 1 and 4 misfire.

Road test included a flashing engine light (the engine light has been on for a long time indicating a small leak).

Suggestions?