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Discussion Starter #1
Hello guys,
I have mustang 2015 within 2018 intake manifold, kooks headers and airaid cold air intake. The proplem is when the car runs then if I shift it into neutral the RPM fluctuates (RPM not constant). It seems there is excess air going into the engine. Have you ever seen or heared about proplem like this?

I really need your help guys, because the tuner and the repair shop do not know why is this proplem happening.
 

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my first thought would be to datalog while the issue is happening; with that data they should be able to see what is going on and correct it
 

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Discussion Starter #3
my first thought would be to datalog while the issue is happening; with that data they should be able to see what is going on and correct it
I did that but they still do not know what is wrong with it 😢
 

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It sounds like a throttle body issue, or unmetered air entering the intake.
 
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