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Discussion Starter #1 (Edited)
Hey guys, My 06 GT only has 17k miles and is perfectly maintained and runs great except for a slight idle fluctuation just after it’s started and goes away if you tap the gas pedal or it’s warmed up. The car has a K&N intake, Diablosport Predator tune and Moroso axle back spiral flow exhaust. No CEL or any other issues at all. I cleaned the throttle body, but didn’t remove it so it is possible the back of it needs to be cleaned (which I am going to do next) and the MAF looks perfectly clean. It has new plugs and with only 17k miles I can’t see the O2 sensor being bad. Just wondering if anyone here has experienced the same thing. Sorry for the long post but I wanted to give you all of the details. Thanks a lot!
 

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I'm guessing you are talking about a high idle? Any car is going to have that happen when it is first started when cold.
 

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Discussion Starter #3
When I start it up it idles smoothly right around 700 rpm but after 10-15 seconds the rpm’s surge up about 150-200 rpm’s until I tap the gas or put it in drive.
 
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