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When I had a lean condition, I pulled every single vacuum hose and inspected them. I ended up finding several vacuum leaks. Fixing the leaks helped immensely, but the lean condition was still there. After inspecting and testing every single sensor (all in spec), I ended up pulling the injectors and sent them to be ultra sonically cleaned. This made a world of difference and solved my lean issue as well as my crappy idle and somewhat poor fuel mileage.
So check all vacuum hoses and test all sensors. If everything is in spec, it's probably dirty injectors. All the fuel injector cleaners in the world won't get them completely cleaned (believe me, I tried EVERY one). Get them ultra sonically cleaned.
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