It might be better if you give the full story from the beginning.
What vehicle, fuel and engine is it?
What symptoms is the car/van giving?
What fault codes do you have?
What code reader has been used?
With this information, you might get some sensible advice!
If a clogged fuel injector continually struggles to disperse fuel to the engine, a time will come when it misses the fuel supply completely and the engine will misfire. The misfire will easily be felt while driving, and often requires immediate repair by trained automotive repair specialists.