I am still having the cold idle problem on my 1988 2.6L Trooper. If you want a very detailed description of the problem behavior and what I have already done to try and fix it, you can look at some of my previous posts.

Cold Idle Problem

Specifically, my question today is if there is one (or more) temperature sending unit(s) that tell the ECM that the engine is cold or warmed up? Since it runs perfect once warmed up, it seems that perhaps something is telling the ECM that the engine is warm when it is actually cold.

The Idle Air Control Valve appears to be working fine. The IAC has strong vacuum at start-up which decreases to minimal vacuum once warm. I can not find any vacuum leaks. I have used propane and starting fluid everywhere I can see a vacuum/air intake hose and still have found no leaks. Just for some background, this all started after the Mass Airflow Sensor (rebuilt Hitachi unit) was replaced along with the Fuel Pressure Regulator. This was done to fix a no start/flooding problem. I am not looking to beat a dead horse, but I can't let this go. It is driving me crazy and I am afraid that this problem could end up causing some other more major/expensive problem. Thanks in advance.

I added a link to my previous post. Hopefully it works!