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Had a similar DTC and symptoms, my truck was not chipped though. Actually turned out to be a bad EGR valve, it's definetly worth a check. My EGR valve got bad enough that the truck couldn't even start. They thought it was fuel pump related because of the trouble code and the failure to start. I actually dropped my fuel tank and searched to make sure I didn't have debris in it. After about a week they pulled the EGR valve, low and behold it was dirty and was the culprit.
I have gone through roughly 3 EGR valves with my truck, but as a positive to everyone, the newer EGR valve design from Ford seems to be very solid. Keep in mind if your EGR valve has the coolant line going to it, then it is the old style.
Also to anyone who is still seeing slow coolant loss after the venturi tee and replaced radiator the older EGR valves are suspect to allowing coolant to leak.
Hope this helps you with your truck.
2008 F-350 SRW "4x4 Off Road" Package Lariat