starts and then stops Wolkswagen Polo year 1998

The problem I have is that I give it in and then stop and change spark plugs, spark plug cables, pump relay, oxygen censor shows no checking on the board, disconnect catalytic and all the fuses are fine but still with the same symptom someone could help me

Try the exhaust pipe before the catalyst and test it, because the catalyst if it goes hot and passes through a place where it is full of water is usually closed if it falls a lot of water, also see if the exhaust tube exit

Something similar happened to me and it was that I took too much air because a hug was lazy then started and drowned it capable of luck

Of the cases that I have seen in Pole 1.4 AEX, in one it was stopped by a failure of the Hall sensor that carries inside the distributor, in another; He started and stopped and it was that the distribution had been skipped (a few teeth) and another was the problem of the coil's module but you say that you have already changed the coil and it goes together with the module. Greetings!!