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Going to need a little more info than that to get you started on diagnosing a problem. Any CELs? Have you checked the charging systems (battery, alt, etc)? Last time this happened to me I ended up having a dead cell in my battery.
Since you have a CEL, do you have a buddy who can run you over to the auto parts store? They'll let you "borrow" one... most likely have to leave a deposit, but they should refund it when you return it.