Kia Cerato EX 2.0 with Landi Renzo Gas Installation: Misfire & Gas Interruption Issues

Hello.

So far I am the happy owner of the Kia Cerato EX 2.0 car.
I have a Landi Renzo gas installation there, but for some time I have had a big problem with stopping the engine from running on gas (misfiring / cycle failure).

I've seen a topic like this here, but it's very old, so I don't want to dig it out: Click

To the point:

I bought this car in September 2016 (born 2004), complete with installation. Until December everything was fine, but since December I have been struggling with gas interruption. As in the above topic - everything is fine, as long as the engine is cold, when the car is parked in the sun, or if I drive a bit around the city, jerking starts and the engine works unevenly (revolutions). One cylinder is not working. There were four mechanics in the car, each with his hands wide open. My hands are dropping by themselves, too, because I don't know where to look for the cause of the problem. It runs on gas as it should. Sometimes, when I stand at the traffic lights, the revs drop so much that the car shakes like on a 30-year-old diesel. There is no final solution to the above topic, and the author of the topic has not logged in here for a long time, so I am asking - has anyone encountered a similar problem? I will be grateful for all suggestions and any kind of help

Leaks in the inlet / vacuum.
Jamming injectors.
The ignition system, warm coils like to catch a puncture and the gas needs a better spark.

I am not a mechanic, hence my question - should the mechanic be able to eliminate and thus indicate the culprit? Are the above problems detectable without first replacing components one by one?

Sometimes it is time to replace the coil, cables and candles in every car. He just came in yours too. Any mechanic will tell you that. Misfires are the fault of the parts listed here.

Your problems will be taken care of by a gas engineer, not a mechanic. Of course, everyone should be familiar with injection systems, drive a car with an insight into the engine operating parameters and on this basis conclude that the problem is the gas installation and send it to the gas supply, but ..... it is Polish and a mechanic is not equal to a mechanic. Drive to a good gas generator from LR.

There the Medes sit and they often fall.

I have the same problem with the chevrolet spark m200 with the 1.0 engine, I replaced the candles, coil, wires, filters and there is no improvement. The injectors work like the old diesel (but apparently this type has it). It seems to me that the problem lies with the dosing of gas, but I can not see anything because I do not have an extensive omegas software, only a preview of the basic parameters. At home, I still suspect a faulty lpg pressure sensor. I may be wrong, but maybe smarter colleagues will suggest something more.

At least insert data / photos from these basic parameters.

Sure, as soon as I have the opportunity to put it in