For a while now my car (1.6 SXi) has been "jerking" while coasting or decelerating around 2000 rpm. Accelerating is fine, seems a bit sluggish but nothing major.
there is no warning light on so no fault codes to read. Ive changed the lambda sensor and ran some fuel injector cleaner but it still does it.
What could it be? A while ago when the spark plugs were changed, one had gone black. But once they are changed it makes no difference.
Im wanting to get this sorted as im wanting to sell my car soon. Anyone know whats wrong?