Thanks. I replaced all spark plugs and coil with dealer parts on my sons 2015 Honda Civic. It still only got up to 22 miles per hour. My neighbor said try pulling off each coil connection one at time and if there is a change in the idle the coil and plugs are fine And the idle changed on all but one. The one farthest to the left. What is my likely problem and what should I do???
You are leaving out important information.
What are the diagnostic codes and live/freeze-frame data telling you?
The information supplied by your neighbor is completely false and will destroy your electrical system. You could get away with doing this on ICEs maybe 40 or 50 years ago but not today. I'm sure your neighbor meant well but doing this is almost as bad as disconnecting the battery while your engine is running.
