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Rough idle at start up, turn off engine and restart then idle is smooth
I had a similiar condition with my m54b25. I believe it was a bit of coolant getting by the head gasket and burning off when I first started the car. After the initial rough idle and burn off it would run fine until it sat over night. If i cracked the cap and didn't let the pressure sit over night it would be a lot better on next start. Might move onto some leak down / compression tests next in your journey.
Thank you. I will try the coolant pressure release test.
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