[Johan123m]

I guess the returnsprings on my throttle bodies ('73 mfi) are worn.

the throttle plates don't return to a full stop so the micro switch isn't engaged and the car starts running way to rich

Last weekend the engine even died on me from to much fuel when I stopped at a traffic light (and I couldn't get it started again)

Is it an easy fix to change these springs? are they still available at porsche?

or is their another cause...i read in some treads the throttle valve bushings could be worn?

I don't want to spend to much on a rebuild of the throttle bodies because I'm building a new engine, so a temporary solution will work. Put an extra spring on the throttle linkage perhaps?
Thanks
Johan