Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
The collapsing vacuum line makes me think you have a vent solenoid that is not opening properly
There is a GM bulletin for diagnosing the P0441.
It has been a couple of days since I have heard from you. Do you still need assistance? I have also noticed that I have not received a rating from you. If for some reason you question did not get answered please reply. I am only compensated for my time when you leave a positive rating. Your understanding is appreciated.