well ive been hearing a strange noise from my motor. when idling it has a kind of a miss maybe, i dont know to describe it other than saying it sounds like it is missing. then also when i let off the gas while driving and start to coast ill hear a kind of tin cannish sound until i push the gas again. Mind you i am running open headers right now with turndowns. It seems to run fine, however, just cant figure out this noise....

 

It sounds like gravel being shaken in a glass jar.

 

best way I can describe it is it sounds like the motor hampsters get pissed off and bring out there hammers are start banging my cylinder walls

 

Sounds like more of a slight rattle than an actual knock.