Can somebody help please?

Question

I already replaced my Intake Valve Solenoid. Code P1111 is still showing and idle is still high.

Answer 1

Have you replaced your oil and filter in the last 4k miles? if not start by replacing the oil and filter, use a good oil like Mobil 1 or Pennzoil ultra or Platinum . The RPM's are high because the car going to fail safe mode.

Since the Intake valve timing control solenoid valve uses oil flow to control timing, dirty oil can cause the valve to stuck open or close.

https://www.autocodes.com/p1111_nissan.html