2004 maxima rattles on acceleration

[2000limited04maxx]

I have a 2004 maxima, I have noticed a rattling/buzzing noise when i accelerate from a stop or pulling a hill usually around 1500-2500 rpms, never does it while idling. I would think if it was a timing chain problem it would do it all the time while running. Anyone have any ideas as to what it could be?

[inafogg]

could be as simple as loose exhaust heat shields.common problem