Symptoms of afm problems are flat spots in acceleration. Bouncing idle is
usually an air leak.

Worn throttle body?
Vacuum hoses?

On Saturday, August 29, 2015, Larry Alofs <lalofs@gmail.com> wrote:

> I assume by MAF you mean the AFM, the air flow meter.  I wouldn't mess with
> that until thoroughly checking/testing/adjusting the switch on the throttle
> body.  Bentley 24.33-36
>
> Larry A.
>
>
> On Sat, Aug 29, 2015 at 10:20 AM, Spencer Allen <spencervw@aol.com
> <javascript:;>> wrote:
>
> > Hi all. Need some help or suggestions to fix an idle problem on my 85 1.9
> > auto trans westy. Engine idles ok at start-up idling around 1100 rpm when
> > ambient temps are around 80+ and around 2000 when temps are cooler
> 60s-70s.
> > The bouncing starts when after driving on highway and engine is warmed
> up I
> > put car in park or neutral then it starts revving up and down between 800
> > and 2000. It runs smooth at highway speeds and around town with no
> surging
> > but at  stop lights or stop & go traffic and my foot on brake I can feel
> a
> > slight pulsing. Within the past year I have installed new O2 sensor, temp
> > II sensor, cleaned grounds and replaced some of the small vacuum hoses
> and
> > plastic tubing. The plug for the idle adjustment has never been removed
> > during the past 30 years so it hasn't been messed with. Should I be
> looking
> > at the MAF next? Any help or suggestions would be greatly appreciated.
> > Spencer
> > 85 westy auto
> >
>