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> 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
>