2003 K12 Ideal issues

Hi All
New here, and looking for some help/advise

I bought my daughter a 2003 K12 for her 1st car, and very happy with it, seems to be the perfect 1st car.

Just got back from my hols, and she's said it not running well
After chatting to her, it seems to be...

When idaling, the car revs seem very low and the car is shacking
If the lights are turned on, the revs drop more
If the radio is turned on, the revs drop more
It seems the more things you use, the more the revs drop
Twice, it has cut out totally when pulling out on a roundabout, and the only way to pull away is full throttle

Before this started, the engine management light came on (Could be a read hearing)

I'm suspecting either the alternator, or the voltage regulator on the alternator

Any help or pointers towards the right direction of this problem would be very grateful
Thanks
 
Revs dropping when you use electronics is just part of having a small engined hatchback, so nothing to worry about :) people aren't joking when they turn off their A/C or headlights when racing because it adds power: its the truth to a small extent. Not sure about it cutting out .... explain that problem in full?
 
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