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I'd 1st suggest cleaning out the throttle body as these get clogged up with carbon and some brake cleaner washed through helps free things off.
I'd also check the condition of the connections to the throttle body electrically, disconnect it and inspect for corroded pins and any wiring damage
if this is OK then the throttle body may have to be replaced
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Ok its an electric throttle on these, which if gummed up with carbon will struggle to move properly and then shut themselves down - hence my suggestion of trying to clean it out
if this doesn't help then its likely to be an issue with the throttle position sensor, which is built into the throttle
so the next action would be to replace the throttle body