Need help with my GT, tranny and electric

techium

New Member
Dec 8, 2005
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Jersey
For reference I have a 2001 auto vert GT.

For starters, if I leave my car for a day or two without driving it, the battery dies. I know there is some kind of battery drain but I was wondering how I go about fixing this? Disconnection the battery every time I want to park it is getting annoying.

Second, there is something wrong with my transmission. If I cruise at highway speeds of above 65 and let off the gas, the car downshifts hard at ~2000RPMS, then upshifts hard again.