Yeah i think that might be your issue. On my wife's e 53, when the FPR was shot it woukd do that.

After replacing, WOT no load wouldn't move the needle half a psi.

https://youtube.com/shorts/AEjiWbrrP...SWKqNcv3Itf4xm
Before

https://youtube.com/shorts/ctQFEWT6ftU?feature=shared
After

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)