My g35 has 73,000 miles on and still runs like new. Granted it's been pretty well maintained, but I haven't had a major problem yet - other than I had to replace the belts slightly sooner than scheduled (58K).
Check your air filter and MAF. As well as the intake connections. A loose intake tube or dirty air filter could cause this...
<-- 04 G35 owner, same engine :)
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