I had same issue.
https://forum.mx5oc.co.uk/t/wrong-spark-plugs-fitted/112235
Lumpy running on coasting/overrun. Sweet as a nut with the correct plugs installed.
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I had same issue.
https://forum.mx5oc.co.uk/t/wrong-spark-plugs-fitted/112235
Lumpy running on coasting/overrun. Sweet as a nut with the correct plugs installed.