Is it quite possible it is still a vacuum leak?
This morning (7:30) it was cooler and a bit damp out and I had a fairly rough idle in drive. Fast forward to just a bit after ten and it is fairly warm and dry and my idle was quite tolerable even with the AC on - only a bit of shaking from the car/steering wheel.
I was just playing around with Torque for Android and normally I idle around 730 rpms and with the AC on this didn't change much but if I try to roll up all four windows at once (automatic windows) my idle drops significantly to 670 or even below resulting in that heavier idle.
I'm not sure if any of this helps diagnose the problem but I thought I would post it up.
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2004 Alero 2.2L Ecotec 4 Speed Auto
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