How do you remove the intake manifold cover with a stripped bolt on a 1999 ford windstar 3.8?

I just ran in to the same problem with my 99 windstar, what i did was i used a deep scocket on the striped bolt, after removing all of the outher bolts lightly pryed up on the oppicet end of the upper plentium and it allowed enough pressure to hold the spinning gromet to break loose,.the deep scocket also helped for levrage,hope it works for you as well as it did for me.