Weirdly, occasionally, the first three or four seconds of accelerating, the engine hesitates and then it is fine. Also, usually the car is happy to be driven at leisurely pace (i.e. slightly undergeared), but now it hesitates, and I have to shift to a lower gear to go slightly faster.
It probably needs a service. When the engine was rebuilt (August 2019), it was decoked and was given new spark plugs. I recently changed the fuel filter, and it seems to improve a bit, but it still hesitates. Could it be the fuel pump? Just looking at the receipts, I think my fuel pump is still the original one.
