a good mechanic in Puna ?

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Can anyone recommend a good mechanic in Puna, I'm tired of "parts changers" that call themselves mechanics , I need a mechanic that knows how to diagnose the problem not change parts hoping that they will get lucky.

Some problems can prove inscrutable even to seasoned mechanics. I was just reading some
guy’s sob story about spending 2 grand at his local Toyota dealer, not in Hawaii, yet they were not successful in fixing his car. 
So, what was/is the problem and have you found someone to fix it?

       I have an appointment next week at Wallys, the problem could be so many different things........coil, catalytic converter, fuel pump..the list is endless.