well the IAC valve comes to mind for #1, very common problem, ive changed mine before. those symptoms are 90% similiar to a broken IAC valve.

#2 id say check timing, fuel pressure if possible. Also see if u can determine whether its running rich like misfiring and sooting your bumper, or lean like a failing injector.
need more info about #2 like how it performs throughout the rev-range not just in VTEC.

~kris