How doo Our A4 has recently developed an issue where when driving at low revs the engine has a slight hesitation resulting in the car jerking. This most commonly happens in 3rd gear whilst crawling along in traffic. Having searched around the site I am thinking to clean the egr valve but wondering if anyone has other suggestions on possible causes? The car is a 56 plate S line Quattro with the engine code BRD and has covered 95k with an oil change performed at 92k. The air and fuel filter were changed at 83k and there is a receipt for the egr valve being replaced at 79k. Any advice gratefully received!