I'm in idle but the car keeps reving up and down
Keeps reving up and down
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As this is a fuel injected and not carburetted, there could be restrictions in one or more injectors. There could also be a vacuum leak somewhere.
The best solution (requires a mechanic with the correct software) is to connect to a computer and diagnose by checking what the different sensors are doing / telling, when the engine is idling and surging.
I mostly work on carburetted engines, so my fuel injection expertise is limited
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Search for low level coolant causing this on Hondas or requiring bleeding. Videos on YouTube
