I took my sump off my S2 ERST many moons ago but the box was out at the time to change the oil pump. iirc you just remove the dust shield of the gearbox and drop the sump out, i also think you have to move some thing else as the sump fails on something as you drop it down.

The throttle cable should round the cam pulley cover and over the rocker cover into a bracket on the throttle body. iirc they had a white plastic adjuster with a spring on it.

Mfi is a pain in the ass imo, have it set up professionally is my only advise.