On a related note, Ms Triss has not been running especially well for a while - we have discussed this elsewhere, on Saturday I replaced a fuel filter, a dodgy plug wire, and the plugs themselves - they were a bit sooty in part because I have been running it with some choke as the idle has been a bit low (500 rpm instead of 800) Was discussing this whole thing with my mechanic who gave me a can of Mopar engine cleaner - much like Seafoam I suspect. Was supposed to spray the can into the carb, shut off the engine and let sit for 3 hours. Did more or less as instructed - and what a difference! Too my ears (and even Ms JP's ears) it ran stronger and more solidly.
I realize it is at some level a liquid version of an Italian tune up, but, I have driven so little in the last few years that I think it just got clogged up. Will keep you posted but seems like a good solution for low mileage driving cars.