mk4 fiesta zetec - car erratic driven at steady speed! - gasspringmaker

Hi.

When driving my 1998 fiesta zetec at a steady speed it seems to jolt a bit and be a bit erratic. and when you come to a junction to slow down it seems a bit jolty too.

Someone told me it could be the bottom gearbox mount , but i am not getting any movement from the gearbox.

Any advice would be appreciated.