Question about 2008 Dodge Ram Pickup 2500

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Engine is had starting, idles extremely rough, no accel. at all.

2000 dodge 2500 2wd, 5.9L 24V TDL, auto tran. Truck was running when I killed it and changed fuel filter. It would not start. Lift pump was bad. Towed to diesel mech. Mechanic installed new l/pump, bled air, etc. He said the only way he could keep the truck running (rough with no acceleration) was with a charger(boost) on the left battery. They don't work on electrical problems. He felt the inj. pump was okay. Towed to dodge dealer. Dodge dlr said the injector pump was bad ?? ''STOP'' Towed to back yard before
I have 5 or 6 thousand dollars wrapped up in a 9 thousand dollar truck. This lift pump installation has blown up in my
face and I need to take a breath. Do I really have an electrical problem? Can a bad PCM, etc. make it appear the pump is bad on diagnostics? I ran a scan myself twice. The first time = P0251,P0252,P1688. Erased codes, pulled neg. cables for 30 min. Started engine. It ran about 20 seconds. The second scan = P1688 only. Should I pull the PCM first and have it checked ? Is it possible that the inj. pump and an electrical problem exists simply from changing the lift pump?
I'm hoping someone out there has had a similar problem and
would throw me bone.

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