I here that a engine sound of pinging or rattle when accelerating is common.
I just noticed it after I got gas. I read that it could be others things also.
But what is the most common one?

 

How many miles?. What engine? What year? Last tune up? Just started with this tank of gas? What octane gas did you use? Any mods? The more information you provide, the easier it is to get responses that will help you instead of making you answer more questions.