4000Q Stalls when I let off the gas

[Liotta]

Hello all--

I have a 1985 4000S Quattro.  135,000 miles

It runs pretty good at speed, but when I let off the gas (in neutral),
RPMs fall below idle speed and it frequently stalls.

In recent past I have monkeyed with mixture and idle speed -- because it
was  idling rough---  and now is smoother but --- it will still stall--
so I increased the idle to 1100 or so.  This brute force method helps
the stalling but---- is pretty lame!

My mechanic says I need new injectors--- I have already tried injector
cleaning solutions.

Do you have any ideas???

Thanks very much----


Rick