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Real hard to help from afar. I spent the day fixing a CUCV owner thought it would be a good idea to sand blast the inside floor of the cab. Guess what happened. Had to say I told him so. But from your description it is hard to just say yes its the injection pump. To many variables. The nozzles...

Do you have a connection going to your injection pump that looks like this? And is it getting fuel all the time? https://www.buyautoparts.com/blog/4-common-diesel-fuel-injection-pump-problems/

I would start by seeing if it is getting fuel to the out side line of the filter. If it were a truck brought to me I would start by removing everything that was not original. And from there I would trace the fuel lines. I would check them for leaks. No really I don't know where I would start on...

New cable. Where did you get a new cable? Is it a Genuine GM Cable. I heard of these problems with new aftermarket cables. Lay them side by side and compare. I think that may be where the problem is. Good Luck.

Hard to tell from afar. Try and disconnect the throttle cable and start it. Does the throttle shaft return freely and open freely. Was it dropped and has a slight bend to it? How does it act with the throttle cable disconnected? Report back. Is this the first pump you ever changed? Diesel Care...