1994 Toyota Camry 4 cyl. For awhile, my car was having a horrible time turning over. Then, after driving it for an hour or so, it would turn over no problem. Then it started to go away all together. Then, only to return. This is driving me crazy.I don't want to get an expensive diagnostic as electrical system problems are tricky and pricey, but is this a battery problem, starter problem, or what?