Hi

My Ford Focus 2008 Tdci has an issue with jerking around 1500 to 2000 revs, when car is under pressure it jerks or if you lift your foot off the accelerator and press down again, I've changed the diesel filter but that didn't seem to improve it, someone suggested cleaning the air mass flow sensor? I've had it in the diagnostic and nothing showed up in relation to injector problems or egr valve problems, any suggestion?