New Update with videos, Please Help

[hodgesvan]

This is my friend's 2001 Pontiac Montana that i have been working on since last summer. It is a never ending PROBLEM.
I fixed the rough idle by replacing the crankshaft position sensor. It now idles great, but until it hits around 160 degrees for the first time of the day. This video shows how it runs.
http://www.youtube.com/watch?v=YJd2amIjEp0

Now it only runs like this when it sits around 8 hours or so. It can sit for 5 1/2 hours and still crank and run fine. So there is something different between 5 hours and 8 hours which makes it run like crap.


Things that have been replaced:
-spark plugs and wires (when this similar problem started a year ago)
-ECM (3 weeks ago,used from chevy venture, only did relearn and it works, no reflash)
-TPS ( 2 weeks ago brand new)
-Fuel Pressure Regulator (3 weeks ago brand new)
-coil pack ( 4 weeks ago, used from chevy venture)
-module ( 4 weeks ago, used from chevy venture)
-both Crankshaft Postion Sensor (2 weeks ago, brand new)
-Catalytic Converter (5 weeks ago, brand new)

Tested:
-MAP sensor (last week, GOOD)

 

[Steelcity]

Don't know what to tell you but I was thinking of this when the van is cold and you know it will misfire until it reaches 160 degrees ,try using a heat gun and warm up certain parts to aid in troubleshooting for example if you heat up the temp sending unit then fire up the van and it runs fine then the temp sending unit is bad . It seems as though you replaced most of the suspected parts . Is it possible a vacuum leak brake booster ?