Cleaning fuel injectors

I have a Bobcat X320 excavator with a 3 cylinder Kubota engine.
Noticed that I was intermittently losing power to the engine.
I purchased a new fuel filter, filled it full of fuel and installed. Let it run for about 5 minutes then tried to move it. It would start to lose power whether it was moving or not.
My assumption at this point is that one or more fuel injectors need cleaning. Did some searching on line on how to clean fuel injectors. This is a Diesel engine about 30 years old.
Some suggested putting an additive in the fuel tank like SeaFoam or equivalent that is designed for Diesel engines.
Another suggestion was to remove the fuel filter, empty out the diesel and fill with the same fuel additive. Start the engine and run for 2 minutes, turn off the engine and let the additive sit in the system for 15 minutes then start engine and run for 30 minutes
The last suggestion was to remove the injectors and let the tip soak in carburetor cleaner. Blow the injector out using air after its been in the cleaner for a couple of hours. Then test by spraying brake fluid through the injector to check pattern. They actually used wire from a wire brush to clean the tiny holes that the carburetor cleaner did not open up.
So what have you done that has been successful?
I assume that not all injectors are the same so the method for cleaning and testing may vary

Most likely you have some sort of fuel flow/fuel supply to the I.P. issue.

An injector problem doesn't typically come and go.

Sounds like a fuel supply issue to me also. I'd check the draw tube in the tank. They can be partially plugged with who knows what. Something floating around in the tank that plugs the draw tube sometimes could also be a problem.

I would not try to work on the injectors. They are kinda fussy. If they don't spray correctly you risk a blown engine. I just put new Bosch injectors in an 8.3 Cummins. They were 100 bucks apiece. Smaller Kubota injectors might be cheaper.

If I remember right that machine has a plastic tank,with the suction line coming out of the bottom.There is a little
well there,and it is where all the mung piles up.Also,they use a rubber fuel line,and they collapse with age.The
parts in that squeeze bulb primer will deform and plug up too.The actual injectors are probably the last place I
would at to be causing trouble.I had one of those machines for a few years,I replaced it with a 331.

On a Diesel engine an injector problem would be more likely to cause a misfire issue. Also most often when an injector fails or plugs it is not intermittent. I would suppose that an operator could assess when this is happening especially on a 3 cylinder engine it would become very shaky and have a lot of vibration when misfiring. If what you are experiencing is more of just a sluggish response then as others have said this is likely a fuel supply issue. Also it could be drawing air in the fuel system. One way to check for this is to slightly pressurize the fuel tank with compressed air and see if any leaks show up. This should be done carefully only using a wadded up rag to seal around an air blower and fill neck. If the tank is real full you may want to drain or siphon it down a bit or you could get a fuel shower as the pressurized air can release quickly. Also hoses can breakdown internally and plug off inside but look fine on the outside. Injector cleaning is best left to a diesel shop with the proper flushing and testing equipment.

Not an injector like everyone says they do not come and go. Have you checked the air filter. I think you are wasting time messing with the injectors. If a good dose of fuel treatment does not help probably not going to help by messing with the injectors.

On my welder with a Kubota 3 cylinder if all the air was not out of the system it would act up like that first run fine then die down and repeat. It sounds more like an air still in the system. Rebleed it and try again. It's not an injector it would give a steady miss if a problem.

What fuel treatment do you recommend?
I use Howes in the winter.
After selling a 2.5 acre rental, my Kubota gets used 40 minutes at a time moving my yard.
Someone will get a slightly used Kubota at my estate auction.
Doubt if my boy will need a Kubota.
Not to worry, I'm still healthy.

(quoted from post at 13:37:12 09/09/22)
Most likely you have some sort of fuel flow/fuel supply to the I.P. issue.

An injector problem doesn't typically come and go.

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Ditto on clogged fuel supply line. Yrs ago I had that very same thing happen on a Kubota M4900. I was advised to check fuel passages in the water separator housing. I located a tiny screen that was clogged. Cleaned the screen & engine would operate with full power output.