Just an FYI...here's the error code info:

P1532. "B" Camshaft Position Actuator Control Open Circuit Bank 1

Check your actuator connection. Beyond the potential vacuum issue, the X will run in a preconfigured "default" mode of operation when it sees a sensor issue. It will continue in the configuration for a drive time before reverting to use the info from the sensor. That can cause it to run OK for a bit then go right back.

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2003 E53 4.6is, titanium silver, black Nappa interior