My friends have been having a problem when driving my car. When they release on the clutch pedal the car lunges back and forth and doesn't really stop until the clutch pedal is pressed again. This doesn't happen to me because I'm used to the way my car drives. Here are the specs on my car if it helps.

1993 Civic EX
100,600 miles
Stock clutch
DC Sports Header
Apexi WS exhaust
New battery, plugs

Could this be a problem with a worn clutch? Could it be a problem with the synchros in the transmission?