This hunting of the revs (something else IMHO than stopping) is usually
cuased by dirt built up in the inner circumference of the air inlet at the
location of the butterfly valve.
Due to this dirt, the butterfly valve doesn't close fully, and let's air
come into the engine although the ECU thinks the valve is closed.
The ECU then gets a signal that the air/fuel mixture is too lean and adds
fuel so it revs up again etc etc.
Just take the look at http://www.pbase.com/tas/various at images 4 through 7
Easy DIY job.
--
Ciao from Holland
AlfistaGJ (Gert-Jan)
Alfa red 156 SW 1.8 Madeno tuned (2000) (soon: GT 2.0JTS)
Golden Montreal 1428700 (1973/4)

"magoo75" > schreef in bericht
oups.com...
> Hi Jazza
>
> I think i have a similar probem. Can you verify if its the same from
> the description below.
>
> I have a 2000 156 1.8 TSpark and when idling the rev counter begins to
> fluctuate from regular idling revs (about 1000rpm) to almost 500rpm and
> then back to the normal idling revs again. It doesn't always happen but
> i've noticed that sometimes you do have to give it a bit of welly when
> trying to reverse the car or it cuts out. Is this like the problem
> you're having? If you could let me know i'd appreciate it. Cheers
> Magoo75
>