Answer:
I help engines spin and pants stay up.
You see a boat filled with people. It has not sunk but when you look again you don't see a single person on the boat. Why?
When you need me, you must find me. When you find me, you no longer need me. What am I?
I begin with the letter βiβ, if you add βaβ in front of me, I become a new word with a different meaning, but still sounds exactly the same. What word am I?
Light hides me and darkness kills me. What am I?
I flow from the Homerβs mouth when he sees doughnuts.