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a faulty lambda would cause poor running and apparent missfire most often about 30secs after a cold start when some of the other s**t that runs the car from cold, start close down (air bypass, fuel enrichment ect) also if you have recently fitted a decat it is most likely because they never...
and i dont beleive the super 4 bullshit. how can 4 earths be better?? in reality it probably diffuses the spark a little. at the very least its a waste of 3!!