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2000 Honda Civic ex vtec THROTTLE BOOT TORN and idle high

Nightflyr *
Richard Kirshy

If your issues is due to excessive slack, you can adjust it by loosening the lock nut and tightening the adjuster nut to get the proper tension then re-tighten the lock nut. Also check that the return spring is not binding or broken.
The boot is to keep dirt out and prevent the cable from binding.
But if road grime got into the cable jacket and is causing binding , you can try to spray lubricant where the cable comes out of the jacket.
If that doesn’t work you may need to replace the throttle cable.