Vauxhall Astra when warm car revs up down up down when warm

Car: Vauxhall Astra
Variant: 1.4 sri petrol
Model Year: 2017
Categories: Engine & Drivetrain
friends car when heats up starts reving up then back to idle then revs every few seconds sometimes cuts out when driving he had alternator changed airflow mass sensor and still doing this any help would be great thanks
Posted: Apr 17, 2025 (3 weeks ago)
Check the PCV valve , breathing system

https://www.youtube.com/watch?v=Jm2YW7U7570
Posted Apr 17, 2025 (3 weeks ago)

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