Perhaps some of you can help me identify what this noise could be.

1) When I start the car on cold morning, it sounds like there are a bunch of loose bolts and nuts bouncing around the engine,...lasts about 5-7 minutes until engine is warm. (valve adjustment needed? or injector ping?)

2) Engine warm or cold, if I rev to about 1200 rpms, I get a loud knock. Not evident any other time, only at 1200. Car idles at around 5-6k rpms.
(valve adjustment needed? or injector ping?)

Thanks
cchkaiban