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How can I fix a misfire on my Daewoo Lanos?

Hello - my 2000 W-reg Daewoo Lanos was misfiring, so I took to the garage and they fitted a new coil pack, leads, spark plugs and sensor. I got it out of the garage and it seemed fine for 10 miles, but then started misfiring again. I took it back to the garage and he said to take it to a Daewoo specialist. Any ideas?

Asked on 2 September 2010 by gavin1983

Answered by Honest John
Very difficult to fix these. Almost as if they were designed to be thrown away after 10 years. The answers to similar problems with Vauxhalls/Opels don't seem to apply.
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