Timing Chain Rattle?

[Weirsy]

alright i did a few searches for this and i am yet to find a problem like mine. When i start my car, cold warm or w.e type day outside it sounds fine, i can rev it up a few times and drive it around easy and shes purrs haha...But once i give er shit for a bit or go WOT for a bit somthing happens and if i let off the gas and the engine rev's down you can here the rattle...This is the same as if i was sitting in neutral and rev'ed it up a bit as it is coming down you can here the rattle.

As it is at idle or during acceleration there seems to be no problem, (that i can hear). I have tried to locat the problem but without a stethescope i cannot decide where its coming from (to much echo).

So my obvious question is : is this yet abothe case of timeing chain rattle but in a different form or wtf is going on.

I have a 97 240sx with 174,000 kms (110,000 miles approx).

thanks everyone.