Fuel Injector Replacement: Stuttering, Power Loss, Misfire

Hello,

Today, after 300,000 km, I had the fuel injectors replaced in my Passat 1.9L with an 81kW AFN engine, hoping to do something good for the car.
The built-in nozzles are also used, but they are supposed to have been refurbished.

Now I press the accelerator, but nothing happens --> loss of power.
When accelerating, there's a significant jolt, and the engine is making a knocking sound.

There are no error codes stored. What could be the reason for that? Could the injectors be faulty?
Please help me; I'm not very knowledgeable in this area.

Martin.

verdiener wrote:

have been overtaken

Re-install the old ones or let the "new" ones be printed and check the spray pattern.

Why don't you mention where you had the nozzles exchanged and who manufactured them? I would say that, in your case, you are the right person to provide that information.