Got 200clc 5,000 hours runs rough just off idle at idle seems fine, low on power and even dies sometimes. New injectors couple hundred hours ago codes come up 1076 fuel pump detected defect and 1569 fuel derate active. going to check fuel pressure but my gut tells me it is in injection pump because when it is cold runs fine till it gets temperature up.
Check the two larger wires at the pump but pretty good chance you need an injection pump. Its a Stanadyne de10 they are problematic at best. Fuel derate is causing the engine to bog and have low power