my 94 gt seems to be running lean. i have the fuel pressure set at 39 idle and 45 WOT. when i changed the plugs they were frosty white. also i noticed a vacuum leak, right under the intake manifold and on the upper intake, when i capped it the car runs like crap and surges, and stalls when i turn the wheel. with it off the car runs alright but when i rev it, as the rpms come down it will stick at 2000rpms. any help would be appricated. thanks!!