Q: My car occasionally won't start - 2003 Jeep Wrangler

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I've starting having a problem with my Jeep starting. I initially thought it was a dead battery but after getting it juiced up at O'Reilly and having it checked out along with my starter and alternator, everything seems good with those and then the Jeep worked fine. Both times it has happened, I've been parked on a slight incline (once uphill and once downhill). Today when it happened, I was parked facing uphill and started to roll it backwards in neutral with the ignition on (so the steering wheel wouldn't lock) and the dials started to sputter and then it finally turned on (while it was rolling WITHOUT POPPING THE CLUTCH). Is this a problem with my battery terminals being dirty or is it a problem with something in my electrical system in general? If it were just the ignition circuit, wouldn't everything else work (headlights, etc)?

My car has 100000 miles.
My car has a manual transmission.

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