We city Pagoda owners (New York City for me) learn quickly that stop and go, short hauls can lead to fouling and rough driving.
The so called "Italian Tune Up" may help. I take the car to an expressway and run it as fast as safe for 5 miles or so...if fast speed is problem, I do the run one gear lower so the engine can rev at say 4,000 rpm or so to blow it all out.
Works like a charm.
Of course, there can be other problems that this may not cure and the car has to be able to run at least roughly on an expressway.
Richard M, NYC