Two things i suggest, listen under hood as soon as engine is started cold, timing chains make noise
when cold due to worn componets. Also check cat converter for defective catalyst, may not rattle when warmed up.
Motor mounts could be worn as well. But i am just guessing on all of this.
Does the engine run rough on start-up? Is it a rattle or a vibration , that concerns you most? How does it change when you put it in gear? --When cold , then when warmed up? ..... More than one problem.......