P127X codes

I have been trying to track down my P127X codes for a few months now and cannot seem to find the problem. Thus far, I have replaced injectors, UVCH's, and I replaced the IDM with one of Swamp's IDMs. I also have a black CPS.

The truck does not run real rough, but it is not running as smooth as it has in the past. The codes I have are p1271, P1273, and P1274.

What other things should I be looking at that can cause these codes to pop up during a buzz test?

I would start by ohming wires from the IDM to the injectors. Bet you have some ugly stuff somewhere around or including the 42 pin connector on the driver side valve cover. Either that or some kind of injector issue. Possibly could be the connectors in the valve covers or on the outside of the covers.

aside from the codes...how do the injectors SOUND during the buzz test?

all the same? crisp? weak? different from one another?

Yeah, I missed the buzz test part.

the injectors all sound crisp and the same.

I probably need to do a thorough inspection of the harness. Since the codes were there before and after all of the new parts, it must be something that I have not replaced yet.