Hi all. My A3 TDI 140 has recently started to play up on idle. I've done some searching and there seems to be various answers to other peoples queries ranging from the DMF to simply 'a common problem that can't be diagnosed without throwing £££'s at it'. However, I thought if maybe I put my symptoms someone can help... When the car is at idle the whole car/engine seems to shake a fair bit and almost seems like it's miss firing or something, but it's notiocable to the point you can physically see and feel the shake. I think it was initially worse once the car had warmed up but now seems to do it when the car is less warm...although not so much on initial start up. It's a bit sporadic with when it does it, sometimes it'll be on every time the engine ticks over, sometimes it'll go a few ticks fine then sometimes a few ticks jumpy etc etc The symptoms don't seem to change regardless of whether the car is in gear, clutch in, out of gear or any combination of these...it just stays the same regardless. I had a friend at VW who got it plugged in for me and it did come up with a 'cam sensor' issue having previosuly been logged, but the engine light is no longer on for this?! The symptoms DO disappear once driving or even just revving the engine just over idle, it's literally when the car is idling. Also, not sure if this is linked but recently it also seems to be a little less keen to start once the car is warm. When cold it'll start up right away but once warmed up it takes a good few seconds for it to finally turn over?! One final thing, it does have some 'plug n play' chip fitted that was done prior to me owning the car...could this be a culprit as I know these aren't overly recommended? I'm away at the moment so can't get to a garage but also I don't want to fall into this catagory of people who seem to be throwing money at similar problems but not coming to a solution, so thought I'd give it a shot on here to maybe get an idea of what it may be and likely to cost. Cheers all and any advice appreciated.