ECU problems!!

  1. #1
    right long story short

    the ecu on my car was my mates so he wanted it back

    i bought another one and my car runs like a dog on it

    bought another one yesterday got it today and the car doesnt start on it...

    why did the first one run like a dog? must be unlocked as it started my car and the guy said ity ran 3 standard vts's

    the second one i bought off huggy54 and he said his was a standard unlocked one

    if i plug my old ecu back in it works a treat, only problem is that the old one isnt mine lol is there anything i can try to get them working?