Found the culprit,  I will post a summary on what it was later.

Thanks everyone for your help.

Tim

On Mar 10, 2007, at 7:13 AM, John Rodgers wrote:

> OOPS!
> Big screw on the throttle body!
>
> John Rodgers
> 88 GL Driver
>
> John Rodgers wrote:
>> Did you adjust the idle speed screw on the AFM?
>>
>> You seem to have covered everything else. I didn't see it
>> mentioned on
>> your list.
>>
>> Warm the engine - run it around the block.
>> When back home - disconnect the idle stabilizer valve wire on the
>> end of
>> the valve.
>> Start the engine.
>> Turn the very large slotted screw on the AFM. Turn right or left and
>> watch the tach. Remember your start point when doing the
>> adjustment. I
>> count the screw flats - 5 right, or 10 left or whatever.
>> When idle speed settles at 900 rpm you are good enough. Reconnect the
>> ISV wiring and you are good to go.
>> Allow the engine to get cold, Restart. The cold start should give you
>> about 1200 rpm, and after it warms up it should drop back to 900-1000
>> rpm for idle.
>>
>> Regards,
>>
>> John Rodgers
>> 88 GL Driver
>>
>>
>> Tim Marciniak wrote:
>>> Has anyone had an idle stablization control valve that hummed as
>>> Bentley describes it should, but found that after replacing it their
>>> idle problems were solved?
>>>
>>> My van idles at 1200.  Runs fine, starts fine.  But I cannot get it
>>> to idle below 1200 rpm.   I have spent hours trying to figure this
>>> thing out.  Here's run down of what I've done.
>>>
>>> -complete ignition tuneup, plugs, plug wires, new distributor cap,
>>> checked timing
>>> -cleaned all ground connections and replaced all ground connectors
>>> -replaced temp sensor x2
>>> -found open circuit from temp 2 to terminal 10 of ECU.  I replaced
>>> this wire.  I thought I had all my problems solved when I found this
>>> and in fact it did fix a lot of my idle issues because prior to this
>>> fix I had even more driveability issues.
>>> -adjusted and checked throttle position switch
>>> -cleaned idle stabilzation control valve with carb cleaner and
>>> verified that its humming away.
>>> -cleaned throttle valve
>>> -new O2 sensor
>>> -checked fuel pressure--ok
>>> -no vacuum leaks
>>> -checked air intake system, verified that I had no false air issues
>>> -replaced idle stabilization control unit (this is the last thing
>>> I did)
>>> -passed state emission test two weeks ago
>>>
>>> Van runs smooth, no lumpy idle, no hesitation or surging issues,
>>> just
>>> idles high at 1200.  Only thing I can think that is left to do is
>>> replace the idle stabilization control valve on top of the engine.
>>>
>>> Tim
>>> 90 Multivan
>>>
>>>
>>
>>