Well to start with your in the right place. Here's a few things I've learned. Over the next few months you should:
Get a small wire brush or old tooth brush and some "contact cleaner" lots of cleaner ( consider buying stock in a contact cleaner company) start at the head lights and work back removing and cleaning every electical connection.
When you are finished go back to the head lights and start again. Because a:you missed some b: some of them are not clean enough and 3: it's like painting the golden gate bridge, by the time you're through it's time to start again.
Get some carberator cleaner (lots of carberator cleaner) clean everthing Throttle body, intake, iac valve,NOT THE AMM,and just keep cleaning.
Check for vacuume leaks, now check again, NO YOU DID NOT get them all,Check once more, maybe, but don't rule out the possibility of a vacuume leak.
Remove the phrase "That can't be the problem I already checked that" from you vocabulary.
Know that "New Part" does not always = good part.
if you are working on your Volvo and something is in the way TAKE IT OFF it'll save time and skin. it was probably designed that way.
If it "Stalls once first start in the morning then runs fine" consider this:it's a twenty year old car with enough miles on it to wear out two caviler's and a yugo, sometimes I have a little trouble getting started in the morning myself.
Just a few thoughts,
Bret
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rust free in west Texas