I would guess the AFM.... the tracks in it are worn

On Wed, Mar 25, 2015 at 11:51 AM, Kevin Duvernay <kduvey@gmail.com> wrote:

> All,
>
> 2.1 '87 westy with AC, manual
>
> I'm experiencing a slight pulsing vibration at idle. As soon as I get off
> idle it goes away and the engine is smooth as can be. The pulsing does not
> appear to be related to rpm fluctuations as the rpms seem to be holding
> perfectly constant at around 825. The pulsing seems to occur about twice a
> second. I can feel the pulsing through the seat and also the vibrations
> when it pulses are enough to make things in the cabinets buzz, so I can
> hear it. However, from the outside the engine sounds steady as can be.
>
> Just looking for any ideas as to what this could be to help with my trouble
> shooting. These are the relevant things that I have recently replaced with
> no effect:
>
> idle control valve
> idle control module
> throttle body
> throttle switch
> vacuum lines/hoses
> checked for intake leaks, none
> motor mounts
> transmission mount
> 02 sensor
> temp 2 sensor
> all three belts
>
> Thanks
>