I have been tinkering with my 91 Carat and have still not resolved the
hunting issue.

On cold start-up I have to play with the pedal to keep it running - up
and down between 1000 and 2000 rpm. As it warms up, it begins to settle
down. Not as much footwork to keep it running. Eventually it will idle
smoothly around 1000 rpm. But if I try and accelerate the engine above
the 1000 rpm range - it goes into the hunt mode again. Around 2000 rpm
it will run relatively smoothly.

The injectors have been serviced and run in another of my vans, so I
know they are good. All the hoses are good, and I carefully inspected
the vacuum lines just to be sure. The crankcase vent host is new.

I disconnected the idle stabilizer valve after warm up, and restarted.
It was a little rough to start, but after start-up it smoothed out at
1000 rpm like before, and still would not run properly between 1000 and
2000 rpm.

I have not disconnected the O2 Sensor yet.  O2 sensors have caused rough
running on my other vans, and smoothed out when disconnected, but this
is a little different.

So apparently, this takes me to the throttle switch - I think. But this
engine has only 114,000 miles and is clean, so I'm suspicious about
whether it's the switch or not. Never tampered with the switch before,
so a little unsettled about working on that.

Any  input on this would be appreciated.

Thanks,

John

--
John Rodgers
Clayartist and Moldmaker
88'GL VW Bus Driver
Chelsea, AL
Http://www.moldhaus.com