Short trip stop-and-go driving can cause a rapid buildup of normal deposits on plugs, especially if the engine has a lot of miles and there has been some oil leakage past the valve guide seals and rings. The cure here might be to switch to a one-step hotter spark plug.
Diagnose Engine Misfire

I wonder how effective this is? Can anyone share on their experience. Before kc I didnt know na may sinusunod plg correct spark plug, then one time in a random shop I bought one and after installing it, sobrang lakas at gumanda ang hatak ng ssakyan ko. Unfortunately, I wasnt able to keep the box nor the spark plug. Now after reading the one on top, would this be the reason kng bakit gumanda ang performance ng ssakyan ko?

TIA!