Who knew that a single bad spark plug would cause this?! Just getting the coupe back on the road this week but engine was running like a bag of nails. Shaking car at idle, very poor pick up and no performance. I'd have put money on it being a bad coil but turned out to be a dud spark plug. I changed them all anyway as I'm sure the others won't be too far behind. Sailed through the MOT today too
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Rough idle & very sluggish
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