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I'm having the same problem with a 2000 Astra and it has been suggested the answer is that the engine management system needs to be reset. I have not taken the car to a dealer for a major scheduled service. When the engine is cold it drives perfectly. Once warm it misses constantly. It may be the computer is programmed to do this so you will take it in to the dealer for them to service it (BMW's do something similar, but you can often buy a reset tool for BM's). Hope this helps. I'm having the same problem with a 2000 Astra and it has been suggested the answer is that the engine management system needs to be reset. I have not taken the car to a dealer for a major scheduled service. When the engine is cold it drives perfectly. Once warm it misses constantly. It may be the computer is programmed to do this so you will take it in to the dealer for them to service it (BMW's do something similar, but you can often buy a reset tool for BM's). Hope this helps.

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Q: Why does your vectra miss fire when the engine is warm?
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