A idle question im stumped

[Deeznuts]

ok im thinking its a sensor but im not sure. When I start the car and its cold it idles fine BUT!!! when i drive while its cold it stalls. For example I'm driveing to a stop light. When I put it in neutral and take my foot off the gas pedal to stop at the light. The idle will go down dramatically or it will stall/cut off.
Now the vac is fine its pulling a vac at 21 on the boost gauge.

When the car is warm and I pull up to a stop light with the car in neutral it idles at 900-1000 rpm. Im thinking its a sensor I havent checked the codes yet I'll do that tommorrow more than likely.

 

[JerzeySlowpra]

and it only does it when its cold? or all the time, cause if its all the time and you have a bov venting to the atmosphere it will do that

 

[Deeznuts]

it has the stock BOV setup it a stock motor just has a Walbro fuel pump
my bigger concern is it idleing high when warm.

 

[cjsupra90]

make sure your TPS is adjusted correctly also, they are cheap enough, replace your coolent temp sensor. Also, you stated that you have a walbro pump, if it an upgraded unit, have you bypassed the J-tube. If not, do that as it causes the fuel pressure to rise above what the FPR is trying to set the pressure at.