Anyone know what Honda uses to seal around the inside of the throttle body when the throttle plate is closed. I am getting air flow past the throttle plate on an overborded throttle body causing a high idle with the idle screw all the way in. The throttle plate is closed and looks sealed. Its not the IAC the car will still run with the IAC closed and the bypass channel blocked off.

 

you may have a vaccuum leak elsewhere(TB gasket?). I don't think there's any sealant in TBs

 

No its not a vac leak. I have a stock TB and when I swap it the motor idles fine. There is some black/gray hard rubberie sealent brushed around the inside of the stock TB. My bordout TB doesn't have this and I think the little extra pressure from the supercharger is getting around the throttle plate. Its idleing at about 900rpm with the idle adjustment screw all the way in.