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Welcome, I'm Chris (aka Moose).
This is a concern with the vacuum system. Most likely a leak. I need to know which engine you have to help you diagnose this.
Now that I have posted a partial or complete answer, you will see you can rate me. The deposit you have already paid is not transferred to me until you rate me. I would like to receive nothing less than 5 star excellent ratings. So if we are not there yet, please reply and let me help more. If you're not pleased, let me know because rating bad does not result in a refund, there are better options. Rating now will not close this post nor prevent replying. Thanks Chris
Hello Chris here again,
I am checking in to make sure you got everything you expected from my answer. The option to rate my response or reply is still available. I want to make sure you were pleased with what you paid for.
Step one is to remove the climate control from the dash and use a vacuum gauge to monitor the vacuum on the black hose. While driving this should not dip below 8 in hg of vacuum form the engine intake and vacuum reservoir. Can you monitor that?
No problem, we have until the 21st till this post times out from no rating.