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how do i trouble shoot the trouble code items listed for PO174

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I have a 2001 Mitsubishi Spyder 4.0 ltr . The trouble codes are PO171 & 174 lean fuel mixture. How do I trouble shoot to find the problem?

Vehicle: 2001 Mitsubishi Eclips Spyder 3.0 ltr

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Since you are getting both codes, it's very likely that there is an intake leak. If there are absolutely no intake leaks, you may have to replaced the front O2 sensors.
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good answer I found the leak

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