I dont understandThe rubber insulator all cracked can not give enough spark and therefore misfire.
You can replace all 4 but a misfire would easily show itself with a flashing cel under acceleration.
Sent from my iPhone 13 Pro while on the toilet.
what problems it causes to the car? will it blow up engine or some major damage can occur if left as it is? lets say if i`ll drive in that condition around 2000 km?