Australian Car Repair Issues? Ask an Auto Mechanic for Answers ASAP
Has this only started happening since during Winter now, and how cold is it where you are?
There is a few things to look at, all regarded as part of engine servicing.
I would have the throttle body cleaned including the idle control valve IAC, and an upper cylinder clean.
I would also scan the engine for codes, and perform an IAC reset after all the cleaning procedure.
Many workshops can do this for you.
Hope this helps.
Your vehicle engine speed is computer controlled from the ECM.
The ambient temperature at startup in combination with the coolant temp, are the main factors to idle speed. Sometimes carbon buildup causes the idle control to overstep the mark.
EFI vehicles control there target speed with bypass air control, gives the same effect as an Automatic choke of a carburettor, but no components are similar.
Nissan is your best bet to drop it down a little.
Kmart, Ultratune are worth a go as well.
3000 is certainly too high, 2000 would be more acceptable.
I hope this helps you.
Have you had any success with your problem?
I hope my advice has been of assistance to you.