The garage 1320 in hagerstown deals with dsm's , but not strictly dsm's..
Scotts isnt strictly dsm though..? but ive gone there for a lot of the parts i need, their not bad at all.
It seems like its pretty common
I have the same exact problem. The vac gauge reads 20/30, and it only runs smooth once it warms up...my bo0st leak that i cant seem to get rid of doesnt help very much either :|