Sounds like idle stabilizer troubles to me. You may need to clean yours.
There could be other things as well. The 900 RPM is the correct idle speed.

John Rodgers
88GL Driver

AL Ferguson wrote:

> I am having a little trouble in the morning with warming the engine of
> my '87 Westy (gas).
> It starts fine and even revs a little higher (1300 RPM) then idle ~ like
> some sort of choke action is taking place. The RPMs drop back down to
> about 900 almost immediately (about 2 ~ 3 seconds of higher revs) If I
> stick it in gear (automatic) and give it gas at this point, no go. The
> engine doesn't accelerate at all - kinda acts like it is bogging down -
> it will creep forward but not accelerate (this is the problem). After
> about a small city block it begins to run perfectly for the rest of the
> day unless the engine gets cold again. This happens everyday. Now if I
> let it sit and warm-up for a couple minutes it will take off fine.
> I know I should let warm up completely first etc. BUT I shouldn't have
> to. Of greater concern to me is when it gets really cold outside (in
> Colorado), I'm concerned that this problem will get worse.
> I bought the Van about 3 months ago and it has always acted this way.
> Other vans I have owned in the past did not.
>
> Here is what I have seen to check from the archives:
>
> Checked Temp sensor 1 with ohm meter - it reads in spec. The air flow
> meter was just replaced about 3 months ago. Did all the ohm checks on it
> and all seems in order.
>
> Check temp sensor II. It to was in ohm spec. range.
>
> Drained gas tank - Installed new fuel filter/fuel.
>
> That's all I know to do.
>
> Any suggestions that a do-it-youself'r-can do?
>
> Thanks,
> Al Ferguson
> aferguso@brazosport.cc.tx.us