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Discussion Starter · #1 ·
Hey guys, my r33 gts25t seems to start to judder, get sluggish at 5k rpm and then this clears off after 7k rpm. Iv changed oil and oil filter (well done at a garage) and iv run both normal and higher octaine ie shell optimax and still doing it any idea? No other problems she starts first time even in freezing mornings, doesnt die on idle etc.
 

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Discussion Starter · #5 ·
Forgot to say are these easy to fit done them before on my old ef civic but that had a very open engine bay?
 

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bla
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Yep, very easy...

Can you change plugs on the skyline?? There the black boxes sat on top of the sparks... Underneath the RB25 cover on top of the engine..

Either a set of Splitfire coilpacks or Rising Sun performance Coils will get rid of the missfire, hesitation..

The coilpacks are over 10 years old.. Cold weather and hot engine temps are enough to break them down which causes them to give out a weak spark..
 
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