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I posted about a month ago my problems with the check engine light on, and the fault codes that were set said it was running lean - both cylinder banks.
After MUCH work - changing manifold gaskets, etc. - I got a smoke test done to find the source of the leak, and it was the EGR valve gasket!
All is fine now, and I thought others might be interested in this issue.
Good to know you got it fixed Redbob. I have found personally - and seen it on the boards - that the EGR system on both the 4.0's and the 5.0's can be the cause of numerous codes.