I want to enjoy my car on the weekends...

[Polish Nissan Pimp]

Have ya set the IDLE switch ? There is a procedure in the FSM on how to set
the idle switch, this sounds like the problem you are having. The idle
switch learn procedure is not complicated, but most people dunno what it is.
Its part of the TPS- throttle position sensor. Set that right, and I bet ya
the car will idle perfect. My GTi-R in the G20 would do the same thing.
Mike Jez
01 Maxima 5spd
93 G20- GTi-R conversion.