99 deville won't start in morning
So my deville won't start after sitting
overnight, I use a jump booster to start it
and I'll let it run for 10-15 minutes and shut
it down, and it will start right up several
times. But if I let it sit over night it won't
start and the car opens my gas cap door?
Every morning I walk outside and I know it
won't start because my gas door is open..
had battery tested it's perfectly fine.. any
thoughts?