Technical  1.2 Running issues, what next?

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Technical  1.2 Running issues, what next?

Senile Rodentia

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Joined
Jul 5, 2026
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Location
Essex
Hi All,
Picked up a 1.2 lounge (2015) for my daughter to learn in. Now I was expecting some problems because it was cheap, but I'm not sure exactly where to aim the parts cannon next.
It has a lumpy idle and won't rev, struggles under load, then all of a sudden, the revs will shoot round to the red line. It's almost like the mid range doesn't exist when pulling away. Seems to cruise ok however.
So far, it's had plugs, leads, coil pack, vvt solenoid, oil change, throttle body clean/reset, MAF clean, new earth lead/earth points cleaned, brake light switch, tank of Vpower and a bottle of injector cleaner.
It upped the ante tonight by dying a few yards from where I'd pulled away from and refusing to idle for a bit. Eventually managed to get it moving, by feeding it a handful of revs, but it just seems to want to cut out. It also keeps flashing up various errors mostly relating to hill start or esc.

I'm thinking injector clean next, is this the most likely cause or should I be looking elsewhere? Could the tailgate wiring cause the electrical issues? It wasn't throwing any error codes either, except a P0504 which is the brake switch (which has been replaced). Is there more than one brake switch?
Would be interested to know what else could cause this code?

Any help appreciated so I can get teaching!
 
Model
1.2 lounge
Year
2015
Mileage
86000
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