'98 GMC Suburban, fuel injection problem

I replaced the fuel pump this past April. Now, I get a message on my OBD2 code reader that the 'right bank is running rich'. Is this a job for the dealer, or a fix that I can handle? Thanks again for previous assistance.

The exact code would help here, what are your symptoms also?

I think you will need a scan tool that can read sensors.

The OBD2 code is -P0172. The truck seems to be harder to start (longer cranking time)...but not always, a slight hesitation when I accelerate..., rough idle, and it backfired two days ago. It acts like there is a spark plug that is disconnected is the best description I can think of. Thanks again for your help.

Start by checking your fuel pressure. New pumps go bad along with pressure regulators.