I would suggest that the idle air control motor is bad
SOURCE: idle too high +goes higher when put in gear (manual transmision
IAC valve problem. Nissan has a updated harness (with one way diode inside of the harness) to prevent backfeeding for the IAC valve and a new IAC valve also gets installed. That's where I would look. IAC valve or "idle air control" valve.
SOURCE: drive car for 5 min put in park has high idle like 1200 to 1500
You need to scan the computer and drive it with a scanner on it. Check for codes and watch the Throttle position sensor readings. It sounds like a problem with the tps or Idle speed motor.
SOURCE: 1992 Toyota Camry Rough Idle
start by pulling hose off egr valve see if idles smoother almost instantly
SOURCE: 1990 Accord chokes at low rpm idles low.
sounds like you either have a brake light out or you need air in your passenger side rear tire. jk. i wish i could help.
SOURCE: 2004 Grand Am With High Idling Problems too!
Make sure your throttle cable is not bound up on anything. Also where the throttle cable ends at the throttle body make sure it moves freely and there is nothing obstructing its movement..Rpms are a little too high to be a vacuum leak.
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