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Message: <blockquote data-quote="I_LIKE_TURTLEZ" data-source="post: 1567865" data-attributes="member: 31555">Since the ECM thinks both cylinder banks are lean, the most likely culprit is a massive vacuum leak, do not forget to check the exhaust, all of our manifolds are leaking at least a little bit by now. Common culprits are purge valve/solenoid, EGR, the plastic vacuum lines littering the engine bay of every 90's automobile(25+ year old ABS plastic is more fragile than glass..)Strongly suggest not throwing parts at it, it will likely cause more problems because new doesn't mean good, especially when it comes to aftermarket. If these faults occurred after installing the MAF, then that is likely the issue, MAF's have to be virtually spot on as they're incredibly sensitive sensors. If these faults happened before installing that MAF, gently clean the OEM one and reinstall it. Verify fuel pressure/volume, then go on the hunt for a large vacuum leak. A smoke machine generally makes quick work of this.</blockquote>