On your 2001 kia sephia w1.8l dohc 5spd you get a surging or bucking in any gear or speed when you're light on the throttle any idea what's wrong?

have diagnostics run firstjust ran into this recently and it's still being worked on. from a few mechanics, I've had the following suggestions:

check the timing belt (least likely)check spark plugs (could be misfiring)get the catalytic converter checked, as it could be clogged and preventing your car from exhausting properly

you can get full diagnostics run on it at any dealership, then taken elsewhere for the actual work, as the Kia dealership I've had my car serviced at charged me $115 to spray brake fluid cleaner on my rear brakes.