why my engine vibrates with humming sound in the morning?

Asked by Sep 20, 2016 at 09:07 AM about the 2010 Toyota Corolla LE

Question type: Maintenance & Repair

i have a toyota altis yr 2010 engine 2ZR-FE .recently i replaced 4 pcs of
spark coil and 4 pcs of spark plugs cos engine failed to run smoothly .
(spare parts confirmed original and correct spect) after replacement
immediately every morning i start engine,rpm surge to 1200-1300 and
engine vibrates with vibration sound until today (replacement done 10 days
ago)whereas i dont ever hear this sound before

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