Had this code pop up last week, truck was running good no hiccups so I cleared it and continued on. Two days ago put the truck in reverse and it rolled back about 10 ft and stalled out. Fired rite back up and continued on, today the code popped back up. Truck seemed to be surging at low RPM's, ran fine at higher RPM's. I know p228f is states the fuel valve regulator has exceeded its learning limits. Has anyone else had this issue? Truck has full deletes and h&s xrt pro, chip has been run on stock tune as of late and was never run full out on performance. Could it be as simple as a clogged fuel filter?