Engine Jerking

2007 Citroen C4 C4 Grand Picasso
Car: Citroen C4
Year: 2007
Variant: C4 Grand Picasso
Categories: Running Rough, Starting & Power Loss
My C4 jerks at 40+km/hr and at 60+ and 90+ km/hr .After that it runs smooth above 95KM/hr.
I Had a gear box problem and changed a new gearbox .Thought the jerking was due to Gearbox and changed another one,But the problem is same.Believe it is the engine.
Sent to Citroen service to check error but they coulnt fix it.
Can any Citroen expert help
Problem added: Aug 25, 2013 (10 years ago)
When you talk about " jerking " do you mean misfiring ? Never known a gearbox to cause that unless an auotmatic box , possibly .
Answered Aug 26, 2013 (10 years ago)
sounds like coil pack get car scanned for any faults
Answered Aug 27, 2013 (10 years ago)

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