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Hello Debbie and Welcome ...
As you have an EML on ..( Engine Management Light ) at the time that you mention, this is indicating that the ECU - management computer, has detected and logged a fault or faults, somewhere in the engine management systems... It is picking up the cutting out fault and will have logged it as a fault code for you. This could be a sensor fault or wiring issues or even a fault with the main ecu itself... ( the latter is quite rare ) but you see the problem... it's impossible to guess where the fault(s) may be. What you will need to do now is have the cars systems connected to a suitable diagnostic machine - preferably dealer level equipment... to read / scan the cars ecu - to retrieve the now stored / logged fault code(s)... Once these are retrieved - then you / the user - will be directed to the area of fault and that can then be dealt with. To be honest , its usually a sensor fault or a poor connection somewhere... but as I said earlier - it's impossible to guess. What you can do on a DIY basis - is go around all the wiring connectors around the engine - giving them a tug and a wiggle... just in case you have a poor connection somewhere on one of the sensors / drivers etc... If you do happen to hit on one thats causing the light to come on - the light will usually go off then at the next "start" as the ecu will see the fault is cleared. ( Some cars you need to have the ecu cleared with the diagnostic equipment ) ... So try that -its worth a try... but failing that - you will need to have it connected up to equipment as I've mentioned... Many smaller garages have suitable equipment for these these days so if you cannot locate the fault yourself as above - then have a ring around to arrange to have that done and then it will get sorted. The reason the engine holds back on power by the way - will be because of one of two reasons.... either its because of the actual fault in itself - or, the ecu has put the systems into what's called LHM - Limp Home Mode... this is a basic running mode -(default settings) to allow you to get home (or a garage ) rather than break down -- and this protects the systems - so that you cannot rev it above a certain range whilst the fault exists...So thats the way forward on this now as above to get this sorted for you..Let me know if you need anything more on this at all - Please do click on the "OK rating to Excellent ratings" service for me now, Thank you for that... and you can get back to me anytime if you need / wish.. Best Rgds, MIKE. Please note, you are rating the content of my "answer" - my help to you - not the "system" which can experience delays etc which are not under my personal control -or delays caused by "time -off" which we all have on occasion - Thank you.