OK guys I have a couple of issues with the idle, I don't believe that they are related.

1st issue- I installed the Evo X BOV today and the car is acting like their is a vacuum leak, if I punch it then put the clutch in the rpms go way down and sometime it dies. I rechecked the vacuum lines and everything seems to be good.... I don't know does anyone else have this issue with the ix bov?

2nd Issue- If I turn the heater knob to defrost and turn the fan on the RPMs drop to 750 and it idles rough.... ???? Anyone else had this issue?
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Anyone?

 

maybe some kind of voltage drop when the fan and heater is on, i know mine drops a tiny bit when thats all on... but not enough to make it idle rough

 

rough idle= most common cause is a vacuum leak check your lines and the recirculation hoses on the BoV, and every other vacuum line possible e.g. pcv and egr and all that jazz

 

vacuum leak