failure

I have a problem with a Chevrolet Astra of 2001 Motor 2.0 8V, that when thoroughly accelerating, I mean so that pique endures and does not develop and explode for the purification, I have already changed several sensors and actuators thinking that it is the problem but continues to do the same and the only thing that I see abnormal after everything I have changed is that the spark plug Black if someone had something similar, I would appreciate them to help me find the fault

They have not echoed?

It is true Czech to put the tuning, if it is right and expands by the admission, which is what you say, the problem is common, check cables, coil and spark plugs, as well as the state of the injectors.

What fault codes do you need to scan it Czech MAF sensor

You have to check all the ignition and fuel pressure. You may have low fuel pressure.