HELP!!! megane cutting out problem???

hi all thanks in advance for reading i took car down motorway and it seems like every 8 mile / 8 minutes it cuts out loses all power ,but starts back up straight away then drives for another 7/8 minutes and cuts out again i have blocked off egr valve to the cylinder head it has brand news alternator and battery is fully charged know lights are coming up on dash board and diagnostic just showing egr malfunction but sure this is undeleted code from previous problem two different AA guys have looked at this and are baffled / don't know wot it could be as when it is stationary its fine only cuts out when driving any help appreciated andy

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HELP!!! megane cutting out problem???