RPM to low (700rpm) mitsubishi outlander 2.4L 2005

Check your coolant level when engine cold, low level coolant does not circulate very well at idle and will cause poor heating,at higher RPM water pump turns faster to help circulate.
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I thought that the 2005 Outlander petrol motors were 2.4 EFI motors. If you have a carburetor version, yes you can tune it for 8,000 ft above sea level. Being a 2005 model I would think that it should run well at 8,000 ft for they would be tuned very lean to start with to get past the smog laws. To change the settings you will have to pull the carburetor apart to change the jetting. The only adjustment that you can do on the exterior of the carburetor is the idle air mixture.

this mite be a inlet valve problem

I'm sure your check engine light is on try....
https://www.autozone.com/landing/page.jsp?name=top-five-reasons-check-engine-light

hi this could be a few things, i would check your idle as a very low idle will cause engine shaking when the engine is near stalling, idle should be around 700rpm approx when warm. If that checks out all good check the leads and that one is not getting worn and causing a misfire or a vaccum hose is not off, both will cause similar problem. The last thing i can think of is a broken engine mount causing problem as when motor idles or runs at a certain rpm it will shake harder and may be the cause aswell

SOUNDS LIKE THE IDLE IS TOO HIGH! YOU CAN ADJUST THIS AT THROTTLE! YOU'LL SEE A PLATE WHERE THE CABLE IS ON TOP OF MOTOR! IF YOU MOVE THAT PLATE, THE IDLE WILL INCREASE! IN BACK OF THAT PLATE IS AN ADJUSTMENT SCREW! TURN IT OUT, AND THE IDLE WILL DECREASE!

Idle in park: 800-1100RPM is acceptable.
In drive: about 700RPM
Your idle speed is actually controlled by the idle air control motor also called the IAC. There isn't any idle adjustment you can manually set as the motor is fuel injected and EEC controls air and fuel mixture at idle.

maybe the bulbs the filament

650 to 700 rpm is ideal for the 300zx. the 300 was meant to be a performance car used at the rpms of 3000 and 6000. i have a 91 300zxtt that i use as a race car and a low idle is never really a bad thing as long as it isnt searching or loping

more than likely the thermostat is bad (not opening ) need more info ..... only when idling ? do the fans kick on ?