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Mazda 5 2007, 2.0 diesel - Loss power and rought idling - dannyallit
It happened 3x in two months, last two was on 26th dec, 2014 while driving m25.. It sudenly loss power, even put accelerate hard, though using 4th gear to get speed, it takes about 5-10 seconds to respond to high speed, if using 6 gear, again it will loss power, then at traffic light, car stall.. Wait for about 10-20 mins, power resume again..

And yesterday, while waiting in a car park, as has kids with me, did not swithced engine off, with on and off the heating, maybe 10-15 mins, the decided to swithced engine off,, after a while when i started, pull away, again, lossing power even 2nd gear, so, pull car in car park again, noticed idle going up and down without touching accelerator.., switched off, check battery, it was 12,7v.. Need help guys,.. Anyway, theres no any light on dash(engine man light) just lossing power.. Please help..
Mazda 5 2007, 2.0 diesel - Loss power and rought idling - xtrailman

Its always worth checking for leaking turbo hoses.

I would also take it into a garage and ask them to check for error codes.