I find it's a lot easier to adjust the TPS when the throttle body is
removed from the engine. Remove it, take it into the garage or house and
adjust it there. 1/4 inch of movement is waaaay too much, that's why your
off-idle running is messed up. With the throttle body removed, you can
remove the TPS cover and see what's going on when you adjust it.

On Mon, Jan 12, 2015 at 9:58 AM, Kevin Duvernay <kduvey@gmail.com> 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.
>