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?