Code P2284???
 

i have a 2007 Ford F 250 with a 6.0 diesel with 97k miles. The truck always ran fine. on december 31 i was driving down the road and it shut off. after some time
my local ford garage found it to be my HPOP, they replaced it along with the ipr, and oil cooler. when they put it back together it wouldnt run correctly with engine codes P2284, P2288. they said i needed a new fuel pump and my fuel pressure regulator needed a rebuild kit and it wont be covered under my 5 year 100k warranty so i took the truck back and replaced the fuel pump and did the rebuild kit myself and still not running correctly. the only code i have now is P2284 any help would be greatly appreciated. the truck starts hard and runs really rough until it gets some temperature then it runs better butn not right. when its at idle in park and i rev it up the engine seems to hold the rpm up for a second and then will come back down. it also has a knock after i let of the throttle!!