If you think your injector tips are dirty the best thing to do is have them cleaned and tested.
Using a fuel additive at best will only make your problem go away for a short time then re appear.
The old style injectors benifitted very well from the use of conditioners. Or where fuel is stored for long periods of time. Nowadays very few manufacturers recommend the use of fuel conditioners/ cleaners.
Not sure where you live but in Red Deer we have Central Diesel Injection, they have saved me three times on the replacement of injectors. Art the onwer will have his guys pull your injectors, clean then then test them. He will then recommend to what you need to do.
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