1999 k2500 ccsb 454/4l80e combo. Okay, so I have a problem, it all started when I went to replace my injectors. The replacement went smoothly but when I went to start it up for the first time it wouldn't start. So me being the idiot that I am kept trying to crank for 5 min straight. Turns out I blew my coil and the ignition control module. Well after I got everything sorted out and got her running again I threw a code the next day. P0174. After hooking up my ultra gauge and watching fuel trims my bank 2 fuel trim is anywhere from 5 to upper 20s but only when not gassing it. If I'm giving it any gas or cruising my fuel trims are normal and equal across banks. But when I let off the gas when going down a hill my bank 2 shoots way up. I don't know what the problem is anyone ever have this happen to them?