Got a buddy with a c4500, getting a P1093 DTC. Plug my scan tool in and brought up the fuel pressure. At an idle, 160F ECT, I was getting 5076PSI idle came down and I was at 4931. That's the lowest it ever got. Let it warm up a little bit and commanded 160PMA and was getting 23206 and would hold steady. Now injectors were just replace about 10,000 miles ago at the GM dealer. They refuse to do anything even though its smoke white. When I did a balance rate test injectors read, 1. 5.22 2. 0.17 3. -2.30 4. -4.69 5. 2.33 6. -0.22 7. 6.59 8. -7.59 So 1, 4, 7, 8 would be failing. Before we rip it all apart and put new injectors in it I want to make sure I am not missing anything or anything else I should test. Thanks!