Why can't I get this thing started? I've tried everything. Please help.

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It's an automatic wagon model, only has 135k miles on it. Was working just fine but was sometimes hard to start but never failed me. Last time it ran, I drove it on the freeway and at one point it began losing power, I slowed down a little, it seemed to even out and I got to my destination. About an hour later, I went to restart it and it would turn over but refuse to fire. It hasn't started since.