Quite recently, my Opel Astra 1997 started failing at idle speed; it needs to be accelerated continuously so that the engine does not stall. The IAC valve has been replaced and the computer reset as it was indicated, but the problem remained. The vehicle was then scanned and the MAP valve replaced, and the warning that indicated an engine failure on the control panel disappeared. However, the engine has still got some strange and rough noises; it seems as if it purred. I really do not know what caused the problem or what the definite solution might be.

I would like to know what it is that needs to be replaced, the computer indicates the following:
Sensors 1-2 correlation Accelerator pedal position / exhaust butterfly valve
Sensors 1-2 correlation Accelerator pedal position
Electric drive control Emergency starting butterfly valve
Relay/ Secondary circuit fuel pump
When warm, the vehicle does not accelerate properly and does not work as it should.

Unknown sensor will trip and give error code for misfire

My vehicle stalled when driving and, after checking it for a long time, it was finally discovered that the problem was in the electronic control unit (ECU). It is really expensive to repair it and the agency won't cover the costs because the warranty is already expired. I hope my experience helps others with the same failure in the future.