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Originally Posted by amberchamber
that will help! thx! does that work better?
anyway, i let the engine go for a while and the shaking has not come back for a while~~
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I changed spark plugs and the engine is definitely running smoother and idling much quietly, and last two tanks of gas seemed to have shown 7-8% improvement in gas mileage. However, the weak vibration still return occasionally at warm start (there is no vibration at cold start !) I have been trying an old practice of step down on gas pedal slowly all the way to the floor (and release) before a warm start, that seem to have prevented the vibration in last two day, I need to do that for couple more day to see if that really works, if so, it could mean there is a failure in warm idle mechanism which I will ask the Nissan mechanics to look into that again.