First of all, don't worry about all the duplicates in your post. The server just moved to Florida, and I think it picked up a couple rocks of crack on the way.
With the symptoms you're describing, I'd take a quick look under the SC cover for broken, cracked, or missing vacuum lines. If they're all ok, I'd be tempted to change the wastegate valve.
Part number for your 95 is 12353309, and it should be under 30 bucks from the dealer, 15 to 20 from www.gmpartsdirect.com
Since you just bought the car, it would also be a really good idea if you changed the SC oil. There'* an article up in Techinfo if you've never done this before.
Welcome to the forum, and I hope this helps. Keep us posted.