my 96 mark started to whistle very loud. i took to the dealer (same guy has worked on since it was new), he siad the small vacume "valve and diafram" on the back of the intake was leaking. seemed a small issue, however the part is obsolete and he nor i can find anyone who has them. my local yards do have some marks but will not part out motors because they are very popular in hot rods here in cali. anyone who knows what this part is and where i could get one or both (one on each side) i would appriciate any info. the car is stock and very beautiful, i do not want to scrap because no smog.