Audi A3 1.6 petrol, 1998 - Goes out while driving, turns but does not start

Hello, like in the subject
I have Audi A3 1.6 in gasoline, 98years. Two months ago there was the same problem - it went out when driving, e.g. at traffic lights as I was standing, or just when I was driving 40km / h. I fired for a moment, drove a few meters and went out again. It was connected to an electromechanic under VAG - crankshaft position sensor. I exchanged. Four days have passed, the car started to go out again. The fuel pump has been replaced, because the electrician stated that it does not work when firing. After replacing the fuel pump, the car drove about 2 months without a problem, it smoked without a problem. Yesterday it went out at the traffic light, I started it and drove on. Today it went out while backing up and I couldn't fire anymore. I waited a few minutes and the car still didn't start. Turns but doesn't fire. Some peasant told me it was a coil like a gasoline. What to do? Maybe an immobilizer?

Immo while driving will not turn off the car.
Once again diagnostics and checking if the spark or fuel is missing.

In my opinion, the spark, but then what if the spark is missing?

Based on what formed your opinion? If the spark is missing, the first step is to check whether the engine controller has power and whether it "sees" the engine speed.

Female intuition tells me so

Let a car electrician get a better idea and it will overwhelm you.

The spark was checked, we unscrewed the candles and the spark is not on the candle. He was checked yesterday, fired three times, and the fourth did not fire again. He also fired six times today, and not the seventh time. What's next?

Was the shaft sensor new?

It looks as if the spark in the candles was extinguished.
Is there something that controls this spark?
We also checked the fuses if they were tarnished, cleaned and nothing further. The pump pumps fuel because it can be heard.
I thought it was immo fault, that the grandfather would disconnect and the car would burn, but it also goes out while driving. For now, we work alone with my dad, because around 500 zlotys went to the mechanic and there is still a problem.

Added after 1 [minutes]:

Strumien swiadomosci swia wrote:

Was the shaft sensor new?

The shaft position sensor was installed at an BOSCH electromechanical engineer. I paid over PLN 300 for replacing this sensor.

Buddy, neither coil nor immo dirty here.

I'm not a friend but a friend
So what drives the spark?

Shaft sensor.

Was exchanged, maybe he fell again?