Hello, I have a 2012 Opel astra 1.4t. When starting up my car it makes this cluncking/grinding noise…it only happens when warm not on a cold start. Can’t quite figure out what it is, any help is appreciated thank you

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.