I've got a now venerable S reg Hyundai Accent, which has recently started to "hold back" momentarily when moving off / changing gear.
It doesn't do it all the time, but it is noticeable when it does it - it usually starts to pull away normally then after a second or two feels like there's some fuel starvation going on for a fraction of a second, then carries on as normal.
Any ideas welcome on the cause / cure :-}