rb20 idle issues

[western edge perfonmance]

hi all,hope some one here can help with this,rb20 swap in a 240 runs great has safc, chip, t4 turbo, intake manifold,3 inch exhaust, the problem, the car will idle fine and starts fine,runs hard all the way to redline,when you come to a stop after driving push in the clutch it dies,starts right back up when you crank it again and does this when it feels like it.we have changed all the sensors and still this happens,the car split a hose and over heated and the head gasket needed to be replaced,after that this problem started,it was working fine before it got hot.please help!thanks

[kumasan616]

Common causes are a bad/dirty AAC valve or boost/vacuum leaks. Did you clean the AAC valve body?

[western edge perfonmance]

no boost leaks or vacuum leaks,what is the aac valve? is that the idle air control?if so we have cleaned it and relocated it with the new manifold,as i said before it does this on and off like drive and stop 3 times and it dies then it will deside to stay running and idle for the next 3 stops

[mott6904]

Is your blow valve venting to the atmosphere? If so that is your problem unless you are running the maf sensor after the BOV.

[western edge perfonmance]

it is vented to the atmosphere i will try piping it back in,but it was like that before it got hot andit didnt do this,thanks for the help guys

[Yellow4g63]

no boost leaks or vacuum leaks,what is the aac valve? is that the idle air control?if so we have cleaned it and relocated it with the new manifold,as i said before it does this on and off like drive and stop 3 times and it dies then it will deside to stay running and idle for the next 3 stops

Did pressure test your system? your BOV could be leaking and you wouldn't know it unless you did a pressure test on your system.