Ignition oscillators when accelerating / starting

Hello, I have the following phenomenon: After starting (sporadic, not always) the radio demands the code, so there has been a voltage interruption. In addition, also occasionally "swallows" the engine at the strong speed for approx. 0.3 sec. Ignition modules and candles are new, the ignition coils are error-free. Who knows advice? Engine ABZ 4.2, built in 1995