>    Good luck with your quest. One little word of caution it is necessary
>that your tune up items be in good shape no bad wires etc. If you have a
>leaky injector this will not be good either.  So please mark the gear  so
>you can return it to the original position.
>

Do this stuff first, make it all right before you go messing with the AFM.

*Check all the plugs and wires, rotor, distributor cap, timing -- general
tune-up
*Check all the FI wiring harness, unplug the wires at each connector and look
 at the contacts, reconnect, check all the grounds.  Be methodical.
*Check the fuel pressure and the fuel pressure regulator (you need a fuel
pressure
 gauge for this, but it is a useful tool you should own).
*Check all five injectors for proper spray pattern and for leaks -- in your
case
 pay particular attention to the "extra" cold-start injector.
*Check for intake air leaks
*Re-check the temperature sensors -- does the car run well cold and only give
 fits as it warms up?
*Check the AFM wiper track. These wear out, although the usual symptom is
 intermittent "cutting out" while driving.

While the info on the AFM spring adjustment is valid, this sort of thing
usually
is gradual (it can show up suddenly).  Check everything in order, and then you
might want to start messing with that spring.  This is kind of scary work, as
the tension here controls the open-loop mode fuel mixture across the whole
throttle range.

A recommendation is to buy, read, and keep the Probst Bosch fuel injection
manual
in addition to the regular Bentley book (Probst is a Bentley book, too, I
think).
Most of the list vendors sell it.  The FI is not all that difficult to
service,
but it is something with many factors controlling it, and you really want to
deal with them in a methodical proper order.

Good FI mechanics are out there, but are tough to find sometimes.  I advise
that you become one yourself.  The tools (mainly a good VOM, a fuel pressure
gauge, and the books) will set you back the cost of a single repair session
or less.

Malcolm H.