Factory service manual and a good set of tools. There is a free one online: http://www.300zx-twinturbo.com/cgi-bin/manual.cgi
No, you will die.
It's almost impossible without removing the engine, unfortunately.
my 1990 300zx is idling rough what could cause this?
A 1990 300zx headlight is recessed into the bumper. To remove it, first loosen the headlight bracket bolts. Unplug the lights and push the housing outward. Be careful not to ruin the weather stripping for the lights.
Attached to the middle of the engine block right underneath the lower intake plenum, roughly half way between the heads.
there is none
A Nissan 300ZX? No
Yes.
The "1990 Nissan 300ZX" was a very popular model in it's time. The "Card ID" website noted the carrying capacity of the "300ZX" was noted to be a hefty 1500 pounds.
Remove the interioer trim and you will find two nuts to remove and the whole window trim and all will come out as you break the seal of the black gooie stuff.
The 1990 Nissan interior panels are held in place with eight retaining clips. Pry outward on each retaining clip to remove the interior door panels.
Yes my car is a 1990 300zx with a 2008 350z motor and 6speed transmission