I get this rattle sound which sounds like it is comming from the engine, at first I only noticed it in second gear at high rpms but today it did it in third. Feels like I get a power loss when it does it also. Anyone ever experience this? What could it be? Car runs fine after it does it.

 

Sounds kind of like gears griding.

 

sounds like detonation .

 

Uh oh. Time to adjust my fuel.

 

Time to check your compression too.

 

+1 oh yeah...