1999.5 F250 7.3L 6spd manual, When the truck is warm and coming to a stop, rpm will drop below normal idle down to around 500 rpm then rebound back up to normal idle rpm. Every so often it will stall, fires right back up, but it is getting a little annoying. I replaced fuel filter, camshaft position sensor, air filter's clean. I'm new to the diesel thing, where do I look next?

 

Whens the lastr time the oil was changed?
What is the oil level?
What kind of oil are you using?
Are you throwing any codes?

 

As a test, try disconnecting the ICP sensor (Injector Control Pressure) and see if it idles better...(it is located on the forward top driver side of the engine)
Also, when you pull the wire plug from the sensor, look for oil inside the sensor..

 

Scanned it a couple days ago, no codes. Oil has less than a thousand miles on it, Delo 15w40. Oil is where it should be.

I will give the icp sensor a try tomarrow. I dont think you can drive the truck with the sensor unpluged, but I will see if idle is affected. Truck only stumbles/stalls when coming when coming down from motion. Idles great otherwise. I have noticed symptoms seem to be worse when coming down from freeway speeds, I have been getting in the habit of "bliping" the throttle to keep truck from stalling, that is all it needs.