It's probably in limp home mode. Check RPM dial most likely wont go past 2500-3000 RPM in any gear. This is for safety when the ECU find's almost any fault it will cut the engine to save damage. Get the ECU checked for fault's fix reset and it should run properly
SOURCE: My 2000 nissan xterra just quit it turns over but that is it
Distributor,open it up and take a look under he rotor.The bearings usually brake and will not allow the car to restart.
SOURCE: 2000 nissan xterra hesitating when engine is warm
We are having the same problem. We are right now changing the crankshaft position sensor along with the intake and manifold gaskets.
SOURCE: 2000 Nissan Xterra Service Engine soon indicator is always on
The knock sensor is not a huge deal to replace and will not turn on the light. It should be dont though.
The crankshaft sensor is located directly between the engine and transmission. It is dead center at the bottom.
SOURCE: Nissan Xterra EGR valve troubleshoot
check the EGR by disconnecting it to see if there is a change in the engine at idle
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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