C2 Engine light and Revving prob

Hi,
I was just wondering if anyone who has a c2 has had any problems involving the engine light comming and staying on, and whilst in neutral its revving on its on bouncing between nothing and about 1 and a half to 2 thousand revs on its own.
If anyone knows what is causing this, I would be really apreciative of your help.

This is common to all citoens , I have ZX my sister has AX .
1. on mine there was a problem with spark cables , when I replaced them the orange engine light was off
2. sister AX had a problem with overheating the main computer during the summer so we covered it with some insulation so it doesnt take a heat form a hub

Generally there is some problem how engine combustion , it can be various things, best way is to go to service so thay can read from main computer what is causing the light on and non constant revs.

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