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Could be worn, could be bent. Eyeball it some more to make sure.

Something bent or not catching the rack every time. Look at the parts breakdown, ten thousand times to get it in your head, then take the covers off. Nothing else is going to help.

I use carb cleaner to clean anything in the fuel system. Soak the parts a day or two. Blow everything off with compresses air. When you take the front and side panels off the engine, look to see if the IP's are actually in the rack right. They can be a real PITA to get in. Many times I thought...

Good, this old soldier needs to get to bed! Take care and Later!!!!!!!!!!!!!!! Guy

Sounds like it may be a small, pin hole? Or a line not quite tight? Somehow air getting into the system. Or the hose clamps on the soft lines going into the IP's. Did you have any sign of a fuel leak on the engine when you first looked at it?

The thread that shows how to open the IP, is listed below. Yes, crack the lines, one at a time. It will make a bit of a mess, but that's how it is. Then adjust the IP's. The best way to do that is with a heat sencer. You point it at the exhaust for each cylinder, and adjust the IP's so they...

Fuel pump weak Air in the lines, or maybe a small leak Incorrectly adjusted injector pumps How fast is the oscillation? Super fast? Long and slow? The answers depend on the frequency of the oscillation.

When you twisted the pump. you move it out of adjustment. If you want to take ONE injector pump out at a time, its easier to get them back in right. Taking both out at one time is not recommended. Also keep in mind that these engines are self bleeding, but sometimes are a PITA to self bleed...

Its time to figure out just not what's wrong, but how it got wrong. If you have a blockage that far up in the fuel system, you have to ask how. Nothing should have gotten past the fuel filter, nor the water separator. It would behoove you to pull the top cover, (and have more room to see and do)...