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Re: '99 Windstar Running Lean
A TSB is a Technical Service Bulletin that is issued by Ford to their mechanics. They cover various items including fixes to known problems (read "design flaws").
There is a specific TSB for lean codes on the 99 (up to 2001 I think). It requires that the Upper Intake manifold be removed and the EGR ports cleaned. It also requires the bolts to be replaced with a new type. The TSB also mentions replacing a fuel line vacuum hose and one of the valve covers.
I think you need to know your codes for sure. I would not do the work unless you know it is required.
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