I have a 99 f250 that originally had the v10 in it but I have been rebuilding the truck and dropped a 99 7.3 in it. I got it to the starting point last week and it idles good but when you give it throttle it has a bad studder. I'm not sure if it's an injector or if it's bad injector o-rings. Or if it's another issue. If it is an injector how can I figure out which one it is to change it. Any help would be appreciated.

 

I am assuming you have removed all traces of Gas from the fuel system, installed a Diesel fuel pump on the frame rails?

 

I have replaced everything from the fuel tank, lines, all electrical harness.

 

How long have you had it running? It takes some time to get all the air out of the HPO system, just letting it idle will not pull the air out, which will cause some running issues.

 

i'd say you just have some air in the lines. take it out and run it.