a little more idle work needed

[Soma576@xxxx]

List,

As you have read the last couple of weeks, i have come a long ways towards 
making my car's motor and idle tuned properly. Well, it is damn near perfect in 
the garage when it is started up cold and allowed to warm up by itself. then 
it runs more or less flawless.

today was the first day i actually drove the car since then (been putting my 
interior back together) and i have noticed a problem or two.

1. sometimes at idle, it never seems to really want to settle down smooth. 
sometimes it sounds squirrely, other times it is ok. now like oscillating up 
and down such as when cold, it is on a much lesser scale, but my RPMs and oil 
pressure still fluctuate and you can hear it running a little rough.

2. with the A/C on, it is always squirrely sounding.

now when i got home in the driveway, it was sounding kinda rough. 
here are the things i know:
1. all ignition parts are new and properly installed
2. all fuel pressures are ok
3. idle speed switch is being tripped and idle stop screws for the throttle 
are adjusted properly for idle speed take-over. also checked the idle speed 
switch and it does work properly. how do i check the idle motor for proper 
reception of information?
4. timing is good and advance works properly
5. all vacuum hoses are set up properly and are either new or verified 
leak-free
6. new air filter, fuel filter, lambda sensor
7. rest of fuel system was checked by grady and verified ok
8. when i push down and hold the full throttle switch, the engine runs worse, 
which i suppose means it is working. 

when it is running kind of rough, i can hear the frequency valve buzz 
changing from faster to slower, depending on the engine oscillating. is this normal? 
i can't tell which happsn first - the engine slowing down or the FV slowing 
down. sometimes it sounds like the car is running 100% smooth, other times it 
seems like it doesn't want to settle down. 

a couple theories i have are this:
1. the car had been set up poorly in the past with ignition advance present 
at idle, bad timing, and throttle plates not closing properly. i was unaware 
of these problems and i had the CO professionally adjusted with an exhaust 
analyzer at a Ferrari restoration shop. the mechanic was under the impression i 
gave that everything was ok except the CO (which had been messed around with 
prior). since then, i found the above problems and had them corrected. i 
suppose my CO is off now - would that cause these problems? is it recommended i 
find a dwell meter and check this out? i don't have one so i am not sure if it 
ok or not. timing was off about 6 degrees when the CO was set. i remember the 
mechanic saying he couldn't adjust the CO perfectly but it was as good as it 
will get (under those circumstances).

2. the lambda sensor was replaced about 2 years ago and the car was running 
rich for a while after that. could it be fouled up and not giving proper 
signals? i don't want to touch it unless that is possible and should be replaced 
to be safe.

i also don't know if i am having any vacuum problems forward of the engine. 
how do i rule that out?

any ideas are greatly welcomed. i am running out of them!

Andy


[Non-text portions of this message have been removed]