Any easy way to change spark plugs and #3 cyclinder cover?
 

I know I have to remove the first part of intake chamber( where the PCV, Throttle plate and all the cables at) there are 4 bolt hold it to the rest of intake , I can reach 3 bolt pretty easy but I can't see the last bolt at all( on the left lower corner, which behind the throttle cables I think ) Any good idea to reach that bolt? what other stuff I have to disconnect before I am able to lose that bolt?

The last bolt isn't bad but you need a very long extension... an extension with a wobble head is best... then once the TB is free just flip it up out of the way and there are the plugs.