Hi, I hope someone can help me, I have a '97 Bonneville with th NA 3800 and on a recent road trip, it lacked power, and sputtered a great deal.
I noticed it also flashed the check engine light when I slowed down but it went off if I accelerated.
When idling, it seems to shake, but there is no pattern to it (like if you pulled 1 spark plug) sometimes it seems almost normal, other times I am not sure if I will make it home its so bad.
Up to that last road trip, this car has been perfect. It always gets its maintenance like clockwork, and I respect the car so it isn't abused...
Any advice? Thanks for looking!!