i recently installed injector nozzles and im having problems. The truck is hesitating bad. Runs fine at idle but missing really bad when i give it throttle. Hooked up a Holley "Black" fuel pump tonight and it still does it. Hooked the scanner to it and now i get 2 codes:

P-1693:Manufacture controlled computer and auxillary

P-0251:Injection pump metering control A



Anyone having any clue to what that means?

 

How does it run under load?