My holden does alot of shunting and jerking going up hill,i have changed the gearbox,coil packs and leads and it still does it,could the problem be the diff?

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no very much doubt it ,this is a opel and it would help if i could relate to which model ,now it must be petrol as coil and leads ,so check plug gaps 25th and condition sound like you have overlooked the obvious ,plugs only good for 10,000miles .Is this a automatic by any chance ?
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