I found a nice rx7 for sale, guidence please!

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03 p5, 92 miata
hi all. I want to get a project car and im between an NA miata or turbo II. I found this on CL today and its been sitting for a while. the owner told me it needs a new wiring harness in order to run more reliably. What would cause the current harness to make the car not run well and is it a big/difficult job to fix it? I am a complete rx7 newby but have always loved them and really want to have one in my life.

http://newlondon.craigslist.org/cto/3689791556.html
 
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