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Check Engine light came on on my 2000 Expy (5.4l, EB, auto) the other day. Code reader said P0107 - lean fuel, bank 1. No other codes.
A search of FTE brought up threads suggesting it could br as simple as a faulty vacuum line.
Yep - under the hood I found the bank 1 PCV hose disconnected from the throttle body. Looks like it had just worked itself loose as there are no clamps on these connections.
Reconnected it, cleared codes, and 6 hours of driving at various speeds later check engine light is still off.