Urgent help is despairing??

Hello together, am here still new.. Meanwhile I am almost in despair ?? I drive an Alfa 156 2.5 V6 24V with 141kw Year of construction 2002 Meanwhile I have invested quite a lot of coal but with a problem I am not at all right at all. It creepingly occurred that my Alfa when giving gas completely goes out as if someone had pulled the plug (with 180 on the highway no fun 🙁 ) I go from the accelerator pedal he sometimes comes back again. Sometimes he shows errors like VDC times he does not make any error in the memory. The engine control light flashes fast at the start and extinguishes as soon as the engine runs…but often he also does not jump at all. The friendly also does not come forward and taps on engine control unit as with coffee set read. Does someone know how I could proceed there or what I have to consider when changing the engine control unit? Have a used for 450 euros here but then I can build it so easily and then learn with code card? For help I would be really grateful.