I have a 1990 gt with a rebuilt 5.0 holley systemax intake, e cam, edlebrock performer rpm heads, msd 6al igniton, and vortech v1 trim supercharger. The car ran great. I put in in the garage for a few weeks and the battery died. I charged the battery overnight and now the car won't start and idle without giving it gas to start and keep it running. Even then it is missing bad and dies when you let off the gas. Has anyone else ever had this happen? What should I look into first? The fuel pump is running a when the key is turned on. I also have fairly new plugs, wires, rotor, and msd cap.