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probably the jetting, but it could be many other things.
Yes but it runs hotter on high grade which produces more rpms
3-4 thousand rpms
lower rpms use less gas higher rpms have more power
The Sport button on the shifter for the 1991 Honda Accord is to change the motor so that it will have a little more power. The RPMs should go up by about 500 RPMs.
125hp at 6600 rpms
major vacuum leak?
buy a honda
no
If a car is sputtering at high RPMs, the fuel pressure needs to be checked. If the fuel pump can't keep up, this will cause sputtering. Also, the car should be checked to make sure the valves are adjusted properly.
If you have an oldish Honda which is stuttering, it is probably the alternator or the spark plugs failing. If that doesn't work, then try the generator and the distributer.
Because of the loss of backpressure if can affect the idle.