I have a '91 audi 100 5cyl 2.3E. when driving it changes to second fine
and to third fine but in third when it tries to change down again the
revs drop off 100 or so then it changes but it seems like it just
changed back into 3rd because the revs are the same as before with the
same power, after that it changes into final drive fine without
problem. It only does this once in third gear until its changed up or
down, then it will do it again when its in third. any ideas what could
be wrong?