a real low battery can cause funny things. first thing i would do is pull the cables off the battery, clean, clean, clean again. thats very important and could stop it from charging via the alternator. put a charger on it and get it to full charge( if it will) if it has caps on top, pop em and see how the water looks in the cells. use a flashlight. should be nice and clear and full. 1 cloudy cell means its no good. and it most likely wont take a full charge. then if thats not it, you eliminated the first step

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goina hundred in a 55, and i dont know why..
some things were just meant to be..
05 V6 auto, torch red, basic, a few mods
06 V6 stick, vista, premium (g/f`s car)