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Message: <blockquote data-quote="Slippery P" data-source="post: 893422" data-attributes="member: 13305"><p>Dont go spending all your money on a fuel pump yet. Its possible that the lower intake gasket did not seal. Its a better bet that one of the upper plenum o-rings rolled when you installed the upper plenum. If your truck has egr, where the egr tube enters the upper plenum that o-ring can roll or become pinched very easy when installing the egr tube. I would suspect a vaccum leak before anything. If you can get your hands on a scan tool monitor the O2 sensor pids for both banks while spraying carb cleaner around the upper and lower intake gaskets, when they peg rich (.90volts) their is your vaccum leak.</p></blockquote><p></p>