i tested out my civic last night and when i was done, there's this whirring sound when i have in neutral. but when i press the clutch in, it stops. any ideas what this may be? also i don't feel the vtec kick in, you can hear engage cause of the louder growl but i t does nothing. as a matter of fact, the car feels like it goes slower. is this got something to do with the check engine light for codes 12 and 23? i guess my knock sensor ain't connected but i don't understand the egr code. i guess i'll just straight wire them to the ecu and hope it works. but my main concern is the whirring sound while in neutral, cause it feels like something is caught. pls. help all you tuners out there and thank you in advance.