5ktq high 'idle' - another update - getting there!

[Fuzzzydog]

I've been following the tips and advice I've gotten on the list and I am
getting there.

Looks like I have more than 1 problem - but at least 1 is now fixed.
I swapped the Idle Volume Control relay (3 relays wide, under the dash) and
made an immediate and noticeable difference.
Idle is now consistently at 1500 rpm or less. (as opposed to the 3k rpm
before)
Idle does fluctuate somewhat.  I can really tell when it is being
'controlled' by the ISV system

So idle is still a bit high and the engine is either running very cold, or
something is wrong with the temp gauge.  The MFTS is brand new 3 wire one
but gauge barely moves upward.
going to replace thermostat and check gauge next couple nights.  I'm
guessing the high 'idle' is because the ECU thinks the engine is colder than
it really is and is therefore giving some fuel enrichment???  hopefully the
idle fluctuating is related.

Thanks again to everyone for your pointers and advice.