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One update. Few days ago i noticed that my spark plugs were wrong. They were denso q20tt and i changed them to denso kj14cr-l11. Plugged my o2 sensor back and it was little bit better in cruising speed. In first and second gear its fine, no hesitaiton at all, but when i change to third gear and try to accelerate it just wont. After very slow acceleration i finally get to cruising speed, like 50mph it just backfires and bogs. Tried to drive it harder but no effect. Works lovely before it hits operating temperature. New o2 its still on its way, i going to change it when it arrives. But why the lean burn is kicking in middle of acceleration?
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