i am have 1994 Audi 90 90S The battery is dead after 6 months of sitting so I gave it to my mechanic to charge it up for me. I took a battery out of a pickup I have and have been using this battery. Until now (about 4 hours after I put the battery in) it worked fine. My car just wont start.but the only way it would stay running is if keep on the gas. Does anyone know whats up with it?