engine spluttering

[Bubba]

ive notice when i go over a bump, such as one of them random painted roundabouts, its it makes the car bounce as i go over the engine feels like its loosing all power, then pulling for a split second then none again, bit like going full throttle to nothing 3-4 times :/

any idea what this is caused by

(1.3 8v on standard carb)

[mowgli]

chassis earth strap??

[JordyzNova]

carb messing around ?

[Damo]

chassis earth strap??
Al go with mowgli i think its the earth strap between gearbox and shell.