Noticed this morning when the car was defrosting backed up to the garage and i was stood in the garage with a brew and a ciggy by my heater and every 20-25 seconds the engine was giving a little flutter/pop noise down the pipes ??? No sign of hesitation or a miss when driving. Its going well after 6K and returns 48 mpg on a good run but it just sounds a tad strange when lobbing over at low idle. Anybody else notice this with a 1.4T ??