This car has/is suffering from a unresponsive throttle fault whereby if you slow at a junction and then go to accelerate from a closed throttle position the engine does not respond. It has also started to be suffering throttle lag in that when you are cruising and then want to increase the speed you carefully press the throttle and the response is not instantaneous and the throttle moves what seems a long way before the revs rise. I have had the EGR valve and pipework off and checked. Although not too dirty on the first check on the bench with a vacuum pump the valve worked but on a retry it did not. I then took to cleaning the valve with oven cleaner and brake cleaner and it worked every time it tested then. It was refitted and all seemed well. Previously I had replaced the brake switch in case that was the fault and also fitted another pedal too. This fault comes and goes by the way. I have checked for fault codes and there are none and no fault lights when it happens. I have also had a look at live data but unfortunately at the time the engine was working as it should. Any thoughts? It is a 2008 Mk3 by the way

Edited by Michael Thorogood on 26/09/2018 at 15:44