hello
u'd need a proper manual for this in my opinion
like there are plenty of dealers and online shops that deal in those..
you can get some free at reliable-store and it;s actually really illustrative
The Idle air control valve ( IAC ) Gets dirty over time and needs cleaned from years of use. Remove and clean carbon from it, Also clean throttle body with throttle body cleaner. At most auto parts stores Advanced, Auto zone, ETC.
It should be in the H position this is an all wheel drive vehicle. when placed in L this locks your center differential and is for off road or when stuck.