Start with setting the fuel mixture at idle as per the Volvo green book instructions and then see how things go. If it’s set to run very rich at idle then it’s going to be running rich when normal driving as well, even if the correct needle is fitted.
Consider a wide band O2 sensor and gauge fitted to the exhaust, makes it easy to set idle mixture accurately and then check air/fuel mixture when driving. You can use this to ensure you have the correct needle fitted.
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One day I will get rid of all of the rust.
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