I think cruise control (CC) is part of the CC/ISC controller on a 94 111 motor. The first step would be to check for fault code on that module.
It might also be beneficial to look at the engine wiring harness and throttle actuator harness. I have had engine harness problems on 94 111s but I personally haven't had any actuator problems with them.
Bosch Master, ASE Master, L1
33 years MB technician