Low idle until warm, then stumbles

[thekidd]

I have got my 951 running, but when I cold start her, she will idle at 400-500, until she warms up. But when she is warm, and i rev the car when warm, she will dip back down to 400-500 and stay there, until it warms up. She will also do this on a warm start, right after she warms up and i shut her off, then start her right back up. She has all new vacuum lines, but maybe one or two isn't tight enough? I don't hear a vacuum leak, but thats not a true test, I know.

[AA_Ezra]

Not sure if they are the same as the non turbo but you're idle control valve for the ca maybe stuck open. ( aux air valve)

[Jfrahm]

Coolant sensor, O2 sensor and AFM are important when you get warmed up and into closed-loop also.

[mytrplseven]

I'd suggest starting with the DME temp sensor under the front of the intake manifold (blue connector) It could also be the connector is loose or not making connection. Get a copy of the DME connector pin assignments and see if the readings from the sensor are reaching the connector.