My05 has an EcuTek reflash that has been working fine for several months. I had a head unit, CD changer, Sub and amp installed at an auto stereo shop. It sounded good but they miswired the head unit so it had no memory. I brought my car in today and the rewired it. Since then the car has lost all power. The engine stumbles and the check engine light flashes off and on. I've checked the green diagnostic connection, under the dash and it is not connected. Any help would be greatly appreciated.