Betcha money it's a HG. Maybe a burnt valve. Sorry to be so "upbeat".
You will never be happy with the "power" that the Saturn makes. My mom had one. I took it to the shallow mountains of Upstate New York. (Cazenovia area) Damn! That car couldn't even pull it's own weight up the hills! (Almost got passed by a guy on a bicycle....seriously!) Of course, going down the hill into Cazenovia was "exciting" too, with those monstrous brakes.
Kidding. Mostly. You'll definitely like the fuel economy over the Stang.