I guessing its a 3.8 nonsupercharged engine. it's under the engine cover on the driver's side. follow the fuel rail where the fuel injectors are mounted. it's round with a vaccum hose connected to it.
I owned a 1994 Buick Regal Grand Sport for years. It came with a 3800 engine and got over 30 mpg interstate driving. Never lacked power and didn't downshift on hills the way the previous 1988 Regal I...