usually a simple tune up fixes it, plugs and wires make a huge difference, also if it is a RS with throttle body injection, get some cleaner and spray the throttle body clean til the smoke comes out clean.
Sounds like a vacum leak to me.
Yes
Maybe broken motor or transmission mount
There is no such thing as a 1992 IROC Camaro
should be the same thing.
Cut the engine capartment out so it fits
Yes
Yes
It's usually the fuel filter when a car does what you describe.
will a 3.8 engine from a2002 Camaro interchange with a1999 camaro
Yes.
The 1992 Camaro takes 4.0 qts without filter change