sluggish 99 tourer

[flcjr]

so my tourer runs great except for wot in 5th gear if you ease into it its ok and wot in all other gears runs fine, can't tell if its flooding or starving but it kinda falls it's face alittle not horrible but is annoying any ideas?

[sandy]

WOT condition in higher gears causes the manifold vacuum to drop down. If the vac line to #6 cylinder is cracked or the petcock diaphragm is old and split, you'll starve fuel under your condition.

[Daniel Meyer]

WOT condition in higher gears causes the manifold vacuum to drop down. If the vac line to #6 cylinder is cracked or the petcock diaphragm is old and split, you'll starve fuel under your condition.

  That's the ticket!

[flcjr]

thanx i think the petcock is original i will start there need to repalce air filter anyway so need to remove the tank and will replace vacum lines while i am there.