Q: my car is rattling when going up a steep hill am driving 30mph why is on 2008 Mazda Mazda3

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
this doing this?
(2) Answers
Probably 'lean' condition or running hot. MANY possibilities-- should be scanned , if no trouble codes they can monitor sensors for readings out-of-range. NOT parts house 'code reader' , real scanner with Mazda compatibility needs to be used ,with someone that knows how to 'read' it.