Question about 2007 GMC Safari
I would say you are correct thinking its a vacuum problem. On my '98 Safari, I had the same problem and found a plastic vacuum line inside the engine compartment had touched something hot and melted a small hole in it. I was able to cut the bad part out of the vacuum line and splice it with a small piece of rubber hose whose inside diameter was just smaller than the ouside diameter of the vacuum line. It's been running for two years with no further problems.
Posted on Aug 30, 2008
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