I reset the throttle sensor switch as per BENTLY instructions and further cleaned the throttle body and the car fired up and went to a high idle that followed in an idle base being set by me. The engine still would periodically lose power while under load, in some instances occuring every 15 seconds or so, until I gassed up and found that the gas cap had been off all this time. Eventually the pressure in my refilled and properly sealed tank returned and the power loss hiccups disappeared for what I can tell; it's only been a couple of miles since that anyway.

Throttle sensor switch: I should have checked that earlier.

Open gas cap: Just the pump attendant's way of saying thanks and come again, I suppose. Let this be a reminder to you all here in the full service only state.


Thanks for the help everyone