Today I replaced my fuel pump (with a used one) of my Seat Ibiza 2004 1.4 gasoline. I turned the key couple of times to pump the fuel and I did hear the pump. The car started without problems, but it runs very rough. It is like the car is running on 3 cylinders. There is no error on the dash and I also did not find any fault codes when reading the car out. Also when in low RPM the car is shaking; there is not enough power.
What could be the problem that the car is running now like this?
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