During a 12k service Gonnella replaced the ECU after error message 'rear hatch open' remained following accident repair. Now engine is sluggish- can barely go beyond 25mph- then rights itself. Or I stop and start over. Garage cleaned EGR when I returned it and charged me, but problem has returned. I am no specialist, just want the car back to pre-service acceleration levels. What do I tell them to do- put the old computer back? I wonder whether the car had been remapped by Kinghams.