Dropped something in hole where spark plug goes?

Wow not good" If it's a very small piece of paper towel it will most likely get pushed out into the exhaust travel downstream and get caught in the cat eventually burn up and turn to ash and be blown out the exhaust. Once you stop getting the symptoms it will have moved on. Shouldn't be too long maybe a day or two. In the meantime it might cast a misfire code if it does follow up on it. Oh boy, do I hope this helps. Good luck