Beav,
Thx for all the suggestions. You have no idea how much I appreciate your advice.
Regarding the fuel, we switch fuels here around the same time as when we have to adjust the clocks. I've also resetted the computer by disconnecting the battery overnight, to force the engine to recalibrate if it's the fuel, but no such luck.
Throttle body was cleaned after the initial problem had started, but that didn't really solve the problem either. The service manual had pointers as to how to read the vacuum gauge, so for someone like me that's inexperienced, it's an easy way to rule in or out another 5 or 6 problems.
Good thing I'm not really busy with work, which allows me to both work on the car as well as reducing my reliance on the car. Phew!
VK