My experience is that the sometimes engage, sometimes not engage is the amp, and he wild acceleration is generally the actuator. This may not be true for you, but it has held true for all three of my mb's (1 126, 1 123 and 1 201).

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Jovan

'84 (11/83) 190D 2.2 5-Speed; Silver/Blue; Motor No. 00354, 402k mi (340+kmi mine)

'89 Porsche 911 Turbo Coupe; Black/Black; 53kmi
'05 BMW 530i 6-Speed; 302kmi
'19 Range Rover; 30kmi