my car kills ecu's

[jayryan]

My mx5 mk1 1.6 has been in 3 differnt garages scince i bought the car almost 3 months ago.Every thing on the car cheeks out ie the volts in and out of the ecu are all good the c.a.s is all good and the coil pack everything works.The problem is the car seems to damage any ecu's thats put into the car, anybody got any ideas??