Connect Scantool to Data Link Connector (DLC).
Warm engine up to normal operating temperature.
Turn "OFF" electrical devices and A/C.
Monitor "ENGINE SPEED SENSOR" parameter on the Scantool.
Specification : 800±50RPM at idle
Fig.1) Check "ENGINE SPEED SENSOR" parameter carefully after warming engine up, also check engine stall and rpm instability or engine shut down.