drive up a kinda steep hill..
if ur car struggles heaps, well comparing to how it was running before. then im sure ur only running 3 cylinders.
coz my car felt fine and normal speed just when taking off it sounded like a rexxy... i was still hooning with 3 cylinders. when i got to steep hills GOOD GAME
or even easier.. while ur car is on idle.. pull out a lead and see iof theres any noticeable change in the idle.. if there is a change like the engine shaking more when u pull it out that means that cylinder is ok.. but if one of them doesnt make a difference then thats the one that shat itself
one at a time though. pull one lead out ---> notice a change?--->plug back in---->next lead until u find the one thats working
(but not sure if this is the LEGIT way of checking)
lol
**edit
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