Not sure if this will help but will pass it along:
Also just in cas edo you want some info for testing the coolant temp sensor for computer? You just need a multimeter.
Rough, Unstable or Incorrect Idle/Stalling
SYMPTOM DEFINITION:
The engine runs unevenly at idle. If bad enough, the vehicle may shake. Also, the idle may vary in rpm (called "hunting"). Either condition may be severe enough to cause stalling. Engine idles at incorrect speed.
PRELIMINARY CHECKS
* Refer to Diagnostic Notes. See: Flow of Diagnosis\Diagnostic Notes
SENSORS
Check:
* Oxygen Sensor (O2S) - Inspect sensor for silicon contamination from fuel, or use of improper sealant (never use sealant on any waterproof connectors). The sensor will have a white, powdery coating, and will result in a high but false signal voltage (rich exhaust indication). The control module will then reduce the amount of fuel delivered to the engine, causing a severe driveability problem.
* Throttle Position (TP) sensor - If a sticking throttle shaft or binding linkage causes a high TP sensor voltage open throttle indication, the control module will not control idle. Monitor TP sensor voltage. A scan tool and/or voltmeter should read less than 0.85 volt with throttle closed.
* Engine Coolant Temperature (ECT) sensor - Using a scan tool, compare engine coolant temperature with ambient temperature on a cold engine.
* If engine coolant temperature reads 5 degrees greater than or less than ambient air temperature. Check for high resistance in coolant sensor circuit or sensor itself. Refer to "DTC 15 Diagnostic Aids." See: Diagnostic Trouble Code Tests and Associated Procedures\Manufacturer Code Charts\DTC 15\Powertrain Controls - ECM/PCM
* MAP sensor response and accuracy - Refer to "Manifold Absolute Pressure (MAP) Output Check." See: Component Tests and General Diagnostics\Manifold Absolute Pressure (MAP) Output Check
FUEL SYSTEM
Check:
* To determine if the condition is caused by a rich or lean system, the vehicle should be driven at the speed of the complaint. Monitoring fuel trim will help identify problem.
* Lean - Long term fuel trim greater than 150. Refer to "DTC 44 Diagnostic Aids." See: Diagnostic Trouble Code Tests and Associated Procedures\Manufacturer Code Charts\DTC 44\Powertrain Controls - ECM/PCM
* Rich - Long term fuel trim less than 115. Refer to "DTC 45 Diagnostic Aids." See: Diagnostic Trouble Code Tests and Associated Procedures\Manufacturer Code Charts\DTC 45\Powertrain Controls - ECM/PCM
* Evaporative emission control system.
* Perform a cylinder compression check.
* For injector(s) leaking. Check fuel pressure. Refer to "Chart A-6." See: Diagnostic Trouble Code Tests and Associated Procedures\Related Tests and Information\Chart A-6 Fuel System Diagnosis
* Idle speed actuator operation.
IGNITION SYSTEM
Check:
* Ignition system and ignition timing.
ADDITIONAL CHECKS
Check:
* Vacuum leaks can cause higher than normal idle and low IAC counts.
* IAC operation - refer to "DTC 35." See: Diagnostic Trouble Code Tests and Associated Procedures\Manufacturer Code Charts\DTC 35\Powertrain Controls - ECM/PCM
* Control module grounds for clean, tight, and proper routing.
* Trans Range (TR) pressure switch assembly operation.
* Use scan tool to determine if control module is receiving A/C signal. If problem exists with A/C "ON," check A/C system operation.
* EGR "ON," while idling, will cause roughness, stalling and hard starting.
* Battery cables and ground straps should be clean and secure. Erratic voltage will cause IAC to change its position, resulting in poor idle quality.
* IAC valve will not move if system voltage is below 9 or greater than 16 volts.
* A/C refrigerant pressure too high or faulty high pressure switch.
* Crankcase ventilation valve for proper operation by placing finger over inlet hole in valve end several times. Valve should snap back. If not, replace valve.
ENGINE MECHANICAL
Check:
* For broken motor mounts or low compression.