Hello, I recently purchased a 1985 Porsche 944. I drove it 2 hours home. today i drove the car to the gas station. After i got gas she wouldnt start at all. I tried jumping it, we tried to push start it, and still nothing. The previous owner had a quick release installed on the negative end of the battery. We tried disconnecting it and cleaning the the battery and it still wont start. If anyone could give some help it would be greatly apprectiated. Thank you for your time.