Try new spark plug caps. The resisters often burn out and cause poor running off idle. On some models the caps are part of the wire and are replaced as an assembly out of the coil. To save money use genuine NGK spark plug caps (about $5 each). They simply screw on to the end of the wire. If the cap reads higher or lower than 5000 OHM's it should be replaced. The copper core spark plug wire can be purchased in bulk for $1 to $2 a foot. It can be cut to length and used as an inexpensive replacement for the stock Honda wire/cap assemblies that sell for $25 to $45 each.
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