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running lean on banks 1 and 2 on 1998 Ford Mustang Cobra

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check engine light on, code say lean on 1 and 2 banks. Intake manifold leak, has had a fuel pump and regulator put on. Can someone help?
(2) Answers
chevy silverodo 2002 4.8 V8 2 WHEEL DRIVE truck computer read out said "banks 1 or two are running lean . Can some one help
Vacuum tubes are cracked. My '03 Cobra had same problem. Changed everything that everyone said to change and took one guy to pull on the tubes behind the supercharger to realize where it was coming from. It's a vacuum problem!