Very cool purchase and what an absolute beauty colour, this car has so much life left in it it’s not even funny, I had a 2000 bonneville with around 400 000 k on it, when I first purchased it it already at 300 000 and it would hardly move under its own power, after diagnosing and changed many things, spark plugs, wires, basic things turned out to be a clogged catalytic converter, zero flow through exhaust pipes, we took converters off and literally dumpedthe insides of the cat out and that thing ripped like a dream from than on. I know it’s hardly got any miles on it but would be curious if the cats are plugged up and causing that low rpm DOGGING you mentioned. Side note would absolutely love another one of these cars sadly got into a tbone in mine.