As above, but ADY's dont have an ISV
Neither do AGG's, only the early 2E 8v and the 16v/VR6 have them.
As Sean said start off cleaning the throttle body with some carb cleaner. With regards to the MAF I wouldn't clean it myself as it's VERY sensitive. Instead I'd unplug it and see if the car runs as it should, if it does then clean or replace if not then leave it alone.
You might want to clean all the major earth points around the engine too, it'll always help the car run better. On the old jap stuff I've heard from various sources that the earth points were weaknesses over time and lots of cars have gained up to 20hp just from replacing old earths! You won't get any HP from replacing or cleaning the earths but it will run better if one of them has too much resistance.
As Sean again said, a full service including gearbox oil and coolant change will help a lot. New gearbox oil always feels great on the gear changes so it's something you notice rather than placebo. Coolant is good to change especially with the cold UK winters as old coolant won't have the antifreeze properties of new coolant. Old coolant also contains a lot of rust from the inside of the engine block and that rust will eventually kill coolant temp sensors, thermostat and so on.
If it's lumpy bottom end I suggest new coolant temp sensor (about £12 last time I looked), new HT leads (if they look old and perished) and new spark plugs (you can get NGK's from ebay for about £10 for a set of 4). Also replace rotor arm and distributor cap. All this is included in the major service anyway (apart from temp sensor change).
IMO there's no feeling like having a reliable and strong car in the winter months, it makes full use of the cold dense air that helps the engine perform well