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Why wont my ls400 start after putting a new battery in?

(1992 Lexus LS400)
in Boise, ID on July 06, 2011
I had a 5 year old battery in my lexus and accidently left the head lights on with car off for about a hour and completley killed my battery went and bought a new one and it still wont turn over. I've noticed that my spark plugs have been misfiring but have failed to replace them. Could it be spark plugs or ignition?
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Popular Answer
on July 06, 2011
I would have the battery cables cleaned and tightened first, Who installed the battery?
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