Actually - i was just using the tracks as an example because i slow down then get back on the gas and its a slight incline as well.

I know what you are saying that happened on diff car in past - but i know my cables are tight cause i was just in there the other day cleaning my DSP fuse contacts cause radio went dead.. but batt is in good and cables tight..

This happend to me the 2nd time was on flat road but again blipping the throttle.

To me it seems something with alt/batt.

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2006 X5 4.8is Fully Loaded