modus1.4 oasis loss of power whilst driving

I have a loss of power whilst driving i can the engine pull back ..it then had a warning light flash up .. called AA and said was one of tje coils .. changed it .. then work ok for 2 months .. been feeling pull back again had a full service yesterday all new filters spark plugs etc.. drove home pull back still then lost power and stopped dead ... started after a couple of mins .. no warning lights on .. called AA and no faults found and engine looks ok .. back to garage who also find nothing wrong .. but car still pulling back lose power on driving .. any ideas as what this is please
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modus1.4 oasis loss of power whilst driving