I have a 2000 nissan maxima gle 3.0 it has a rattling sound like a ***** is loose but when i press gas it stops what can that be ?

Larry, normally engines do not have to be taken out to change timing tensioners, the bumper assy., A/C condenser,radiator,etc is removed to get access. Best if you get yourself a manual.
Check the attached links,instruction and guides, Good luck
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DIY Video VQ35DE Timing Chain Tensioner and Water Pump Replacement

NISSAN MAXIMA Timing intro MP4

1995 2001 Nissan Maxima 1 3 Water pump replacement

How to fix timing chain rattle Maxima Forums

did this just happen ?? Out of the blue ??,,,, sounds as if it is hard wired ,,,,look for any jumper wires attached to the plug on your fan

Transmission problems check the fluid !!

It's time to replace the blower motor, bearing in blower motor have gone bad.

It sounds like who ever did the rear seal did not hookup the electric overdrive on the transmission.

sounds like engine ping use better gas see if that helps. If not check you engine bay when accelerating.

sounds like solenoid on starter is worn, replace starter.

I had a lot of problem stalling until I bought a new mass air flow sensor online $100 and took 10 minutes to install it.

Howdy,
the rattling sounds like its the hydrolic lifters (tappets or cam followers called also) not really a hard job just a pain cause you've to strip the engine to pieces to do. Its very time consuming so unless you've some experience i'd place this in the hands of an experienced mechanic. This should also stop the smoke problem.

The engine service light is on a timer from service to service so thats nothing to do with it.

The cd player your right about it just need the lazer llens cleaned. You can buy a cd cleaner kit for cheap in any music/record store.

Hope this helps if not let me know and I'll try and find the solution

Cheers

Filter is next to the right tire (pass.side) behind a splash shield.