My car has been sounding like it is ready to loose power when I have it running, I’ve change the battery and when I put in new spark plugs one of my spark plugs had oil on it. I continue to change the spark plugs, when I started the car it kept shutting off when it was running. The engine light and battery light came on when it shut off. I took it for a test drive and it ran just fine to me and after I let it run for a bit and it did not shut off. Would I need to change the gasket...

Oil on spark plug