You would be right.

I'm loving the new power my car has...unfortunately it'* got the mod bug biting harder than ever. I'm gonna have to keep that under control!

Car has always pulled pretty good from 40 mph on up in top gear but now it gets comments. My favorite comment thus far though was the "holy ****!" I got from a female passenger when I let loose at 30 mph...she wasn't paying attention and the 1-2 shift pretty much changed her perception of LeSabres...

I could go on and on and I already have but yeah...really good for an NA.
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IIRC, Don had some KR issues that seemed to be stemming from weaker spark after doing his PLIM, PLOG, and ported rear mani. Mileage seemed to suffer a bit too. So, I says to him "Hey, you know those blue-tab coils I got? Maybe you should try them for your trip up to West Virginia". For those not in the know, "Blue Tabs" are the S2 L67 coils that are slightly hotter than stock, and seem to be comparable to MSD red coils. He tried them.

He never went back to the greys

Now that you mention it, I think I might be having some KR issues...or something...

Ever since the intake yesterday, I've been getting the impression that my car is slower than it was before...today that was confirmed when it downshifted going up two different hills that it didn't use to do so on right after the PLIM...

It was pretty warm today and I did have the A/C on, but I've never noticed the A/C making any noticeable difference in power and it has been this warm before.

Something is off. :? I hope the intake wasn't oversized for my engine.

It'* still faster than it was before the PLIM though. Just not as snappy as it was before the intake.
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Maybe you need to give the PCM more time to learn the new intake, particularly on heavy loading like hill-climbing...how many miles since you installed it?

Hard to say, but probably on the order of 50 or so, maybe a little less.

I can certainly HEAR the extra airflow.
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Something is definitely off. I got 16.9 mpg at the pump today whereas I would usually be getting nearer 20 or 22. I tried adding a couple of gallons of midgrade to see if I was actually dealing with KR. I need a scangauge or something. :?

Here are some other changes that happened at the same time:

I went from using cheap gas (QV or Walmart with 10% ethanol) to more expensive Chevron gas that doesn't have any ethanol (or at least there is not an ethanol sticker on their pumps). I also added some fuel injector cleaner on that tank.
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Where do you live again? Somewhere in Fl IIRC.

I have an HP Tuner that I think would benefit you.

I live in Alabama. You're probably right though, I bet it would be interesting to see what it says.
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I'm concerned about this. Nobody with an L36 ported LIM has had these issues before. Tuning might be a fun option, but I think we need to troubleshoot first.