[snow]

i have just put in some new spark plugs when i drive normaly it perfect but at around 5000 revs it starts to pop misfire losing kick
:flame:

 

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I had this problem when I changed my plugs, I assumed that disturbing the coilpacks had upset them somehow so due to the age of them ordered a new set of splitfires.

Car was immediately cured of all misfires & hesitation with the new coilpacks, though maybe you should try testing them first before you shell out for a new set