Wonder if you can help ? I have a 440 Si - it has started to have problems at low speeds eg at 20 or 30 mph in slow moving traffic I need to drop down to 2nd or even 1st to keep revs up - any ideas ? Runs OK at higher speeds
I am not going to be any help to you but I have an auto 440 si that does much the same -seems worse after filling with fuel but that might relate to temp in the engine area rather than the amount of fuel.
Did you track down what was wrong with yours?