Idle Problem

dronizm5

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2008 Black Mazdaspeed3
Hey guys,

Looking for some input here. I have a 2006 MS6 GT and I recently installed the COBB SF intake. Now I am getting some issues with my idle. I only have had it on for a couple days and if I can fix the problem and keep the intake on that would be ideal otherwise I am going to just put the stock intake back on. So my issue is when I am driving on the highway and put the car in neutral the RPM's drop down to about 500 and then the RPM needle bounces up to 750 RPM and it just fluctuates like that until I come to a stop and then it goes away. When I'm driving on the street the idle doesn't typically do that and all is well. Any input as to what this may be from and maybe a possible solution. Thanks for your help.
 
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