Could be bad cables. Check the battery and alternator at AZ like Rock'n Roller said and also see about changing out the negative and positive cables connected from your battery to the starter and alternator.
Im already looking at cosmetic upgrades but Im having a hard time finding any performance upgrades:( Does anyone have any suggestions on where I can go on the web or in person around Northern Illinois to find any upgrades? Preferably bolt on but even places that did custom work would help. Ive...