Vibration under 3k rpm
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I have a 98 Jaguar xjr bought it with a misfire replaced all coils and plugs and it fixed the problem but after taking it on a test drive I was expecting vibration under 3k rpm while driving. once it gets above 3000rpm car dose not shake and feels normal. And my fuel economy is terrible eats a lot of gas, don’t know what could be the problem no codes nothing so need help! Please
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