I have an 08 c5500 with an 8.1 Gas engine. When the truck is cold it runs fine but once it warms up when you take off from a stop the truck stalls. If you crank it, it will start right back up and be ok for a few min but then if you slow down and take off again it will stall. It does it when towing a load or empty.

It has not caused a check engine light to come on. Scanned it but there are no hidden codes either.

We have put in a new fuel filter which did not help.
We put in a new crank position sensor but still have the same problem.

Any help is much appreciated !!