Okie

My 2001 Accent engine will sometimes "race" immediately after engine
start, or when I come to a stop. Also, I occasionally feel it bucking
at highway speeds. Any ideas what causes this and how easy is it to
fix. Vehicle no longer under warranty.

Thanks,
Okie

hyundaitech

First, have it scanned. I expect your check engine lamp is on or off, but
you will have dtc's P0121 and maybe P0123. If so, replace the throttle
position sensor.