After extended driving periods, when the car is started again the revs drop and the car stalls if not given throttle, I managed to get it home last night by giving it gas in neutral at lights. After sitting overnight it starts and idles normally again. Got codes for high idle and too rich on bank 1, as well as an "engine fault workshop" message in the multifunction display. Also have bubbling coolant in the reservoir, and recently replaced the diaphragm in the pcv valve. Any ideas what this could be?
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