i have a 94 gt and it has been in storage for a year while i was over seas the storage company changed the battery because they said it would not hold a charge. the car cranks and drives but when i floor it my battery gauge jumps and everything in the car cuts off but then cuts right back on. i had this problem while normal driving a long time ago and it was the ground to the ECM but at that time nothing electrical in the car shut off does anyone have some where i can start? and i have allready checked the battery cables and they are tight. any help would be great Thanks!!