after unplugging computers in engine bay car will not drive over 10 kph misses on 2000 Mercedes-Benz E430 4MATIC

mechanic had to pull computers out to replace rs upper control arm,car ran fine before now wont go over 10 km/hr runs rough and stalls they think its a wiring problem but the only thing they pulled out were the computers in the engine bay to get at the bolts. could they have damaged the computers?

Asked by for the 2000 Mercedes-Benz E430 4MATIC