I fixed a very weird problem today. The engine has been running perfectly but suddenly began misfiring and hesitating when accelerating from idle. Also sometimes it would idle perfectly for a while, the next time it could barely idle at all. I changed ignition wires, coil, checked everything but could find nothing (everything is brand new...)
It was an ignition problem for sure, so eventually I decided to change the spark plugs.
That seemed to be the problem, but...
The spark plugs (ngk bp7es) were only about 3 months old[:0] the gap had not changed, the color was right and they just look new.
What could be the problem ? I am thinking it must be something with the internal resistance of the spark plugs?
:?: