Whats wrong with my car? Will it make a 500mi trip? (az to ca)

2000 HYUNDAI ELANTRA
150 MILES
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NOM145
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list:
-I can't turn on the overdrive, when i do, the RPM's go up and down like crazy. from 2000-5000.
-If i turn the OD off its fine.
-Sometimes its really slow to accelerating. But, once i press the gas to a certain point, it like jumps and then accelerates really fast.
-I smell gas all the time.
-When i turn it on in the middle of the day, sometimes it doesnt start. I'm in az so its like 110 degrees out. It turns on, but it vibrates, makes a knocking noise, and shuts off. I have to turn it on and off 5-15 times to get it started without it shutting off or vibrating. Only does it when its hot, or has been running for a while.
-Just recently, when i fill my gas tank, it backs up. No matter what i do, a little gas will come out and then go back in.
-The radiator hose has a small leak, so does my oil. But, i check that every week and its fine. Along with my transmission fluid.

Would it make a 500mi trip? If not, what should i get fixed so it makes it? If i were to get a diagnosis, would everything thats going on show up?
Sep 6, 2011 at 6:03 PM
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NOM145
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Forgot to add: There is no check engine light.
Sep 6, 2011 at 6:15 PM
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WRENCHTECH
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I certainly wouldn't be heading out on the highway without addressing those issues first.
Sep 6, 2011 at 6:20 PM
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NOM145
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Thats why i'm asking....I can't afford anything right now, just trying to get a general idea.
Sep 6, 2011 at 7:15 PM
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WRENCHTECH
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I can't diagnose your car without seeing it. You have serious enough symptoms that you need to get it checked out before even considering a long trip.
Sep 6, 2011 at 7:18 PM
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NOM145
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Alright thanks
Sep 6, 2011 at 8:25 PM