Volvo Troubleshooting Questions? Ask a Mechanic for Answers ASAP
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Check for the vacuum leaks externally with water, and internally with a smoke machine. i think you still have a vacuum leak.
Well, if you're seeing smoke through a sealed intake, that would be enough to cause a problem. The leak can be where you don't see it too under the intake. You should also have an idle air control motor right at the throttle body that can be dirty or even bad too.
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Possibly a bad throttle body, you can test it with a scan tool in bidirectional mode to be sure.
My name is ***** ***** I am a Volvo dealership technician. Did you still need help with this? I see the other expert is not responding. Let me know. Thanks.