Well, I replaced the plugs yesterday, in the dark. That was fun. ;-)
Anyway, test drove this morning and it appears the coughing is gone.
Good acceleration, etc. Used Bosch platinum plus plugs from Autozone (2.99 each).
The engine light is still on. Does this mean there still is a problem? Or do I need to reset it somehow? Autozone won't do it anymore. Tell me its agan' the law.