Another quick low cost solution is to clean the Mass Air Flow sensor. My Carmy has 90K miles on it and when I cleaned the MAF it idled like a brand new car.
Search this site for MAF. You will need a special torx bit (tamper proof) tool to remove the sensor. I did it on my Boxster and it took about 20 minutes.
-Steve
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2001 Boxster S
Desnorkled
Pioneer Avic D3
JL Audio 6.5 inch subs (in the door)
Pyramid 4 channel amp
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