please, help
 

excuse I do not speak ingles very well, i from chile , sud america , I have rx- 7 year 93, i buy a motor in japon, but my car does not run well,on 3000 revolutions the car lost power, the ecu is japanese to , but the harnees is american, please help me , what differences have the rx-7 japanese on american version ., anyone have contact in japan ? please friend¨s anwer me please , very been thankful