it's dripping fuel while not running right..?
if so, then you need to replace the injector/s o rings...just buy a TB rebuild kit, it will have all the gaskets/seals/ and o'rings needed for a complete rebuild...it would also be a good idea to replace the fpr while it's apart....
you need to warranty the engine asap....Grooms will stand behind it if it is indeed their fault....
http://www.turbobuicks.com/forums/buick-v6-turbo-tech/48429-grooms-engines.html
First, check for any stored codes....
http://www.extreme-check-engine-light-codes.com/GM%20OBD1%20Decoder.htm
if no codes, then check fuel pressure, it may be a slowly dying fuel pump, or a bad fuel pressure regulator....