Hi,
    Check the voltage on the afm (air flow meter) wiper.  You may have a
bad spot where the wiper is not making contact. If this is true you can
often times move the wiper board just a little and all will be ok at least
temporary.
Midwesty

On 1/12/2015 11:58 AM, Kevin Duvernay wrote:
> Hey guys,
>
> I recently messed with the tps adjustment to try to fix a 'bucking' with
> on/off throttle that I'm experiencing and it created a new issue. My 87
> westy w/ 2.1 is now hesitant just off idle for a second or two. Depending
> on how the tps is adjusted, it can even actually stall. It's worse if I
> punch the throttle rather than ease into it. Once I get up off idle it runs
> fine.
>
> Problem is, I cannot get it adjusted enough to be perfect. If fact, the
> adjustment seems to do very little to actually change the location where
> the switch switches on and off, which I believe is too far from the idle
> position (lever moves almost 1/4 inch before the switch clicks no matter
> how far I tighten the adjustment screw). If I tighten the adjustment screw
> all the way and tighten the set screw while still keeping the adjustment
> screw tight then I get it to run best, but not quite perfect. Very slight
> hesitation, but I know it's still there.
>
> I fear there may be something worn in the throttle body preventing accurate
> adjustment of the switch. Also, the braided hose that the purple vacuum
> tube slips into seems a little damaged, may or may not be leaking slightly?
> I taped it up, didnt seem to change anything.
>
> Either way, the van ran perfectly before I tried to adjust the switch, FYI.
>
> Time for a rebuilt throttle body? Anything else I can try first? Is it
> possible to rebuild a throttle body myself?
>
> Thanks
> .
>