You don't adjust the idle until you've cleaned the carbon from the intake system. then you need a scanner to perform an idle learn
SOURCE: my 2000 nissan xterra wont keep idle and it
try disconnecting the MAF (mass airflow sensor) - it is located after the air filter, usually a black box in the intake tube. Could also be the IAC valve which monitors the engine temp, that can be disconnected but will cause high idle if removed, dont know where it is on your car though.
If the MAF is faulty, disconnecting it will make the car idle and run again, but will generate a CEL (check engine lamp) on the dash just because the MAF is not seen by the ecu, but it will run on a default map till you get another one fitted.
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