Guys, I replaced the Ignition coil with a Delphi brand zero coil last December, so far I had no problem. When I loaded the car with gas before 4500 km ago, I started to feel intermittent kicks (as if the car could not burn the fuel that it took time to time). When we looked at the spark plugs during pediatric maintenance (4500 km ago), we saw that one of them turned yellow and as a team I changed all 4 spark plugs. Last week, I used würth's fuel system and injector cleaner. I added half a tank of gasoline and I used the vehicle mostly at high speeds in gasoline until I run out of gas. He made a misfire occasionally while using an injector cleaner, but I read from the forums that this is normal. Now when the half tank is out of gas, I bought half tank again and started using the vehicle in gas. Even if it wasn't always, when I loaded on the gas once in a while, it started to misfire as if it couldn't burn the gas as before. Do you think the spark plug is gone again? If it is caused by the spark plug, how long will the spark plug last? or is the injector cleaner I use is likely to damage the spark plug?
Thanks for reading patiently.