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06 F250 6.0 surging turbo boost and stall at takeoff
I have an '06 250 6.0 with 93K miles. I started to notice surging turbo boost (~3-5 psi) while I'm driving down the road at constants speeds. It surges up and down every couple of seconds. It does it sometimes at low rpms and ~40 mph and will also do it at highway speeds of 70 mph at constant throttle. Does not do it consistently.
I have also had the truck want to stall at take-off after running the engine hard. At a stop it idles fine, then when wanting to take off it will stall for a second and then pick up and go with no issues.
It only seems to surge and stall when the engine is up to temperature. I had a CEL come on once with code P0401. I cleaned the EGR valve and cleared the code and the code didn't come back on. I am still having the surge and stall issues after cleaning. Any idea what is going on?