possable

Having a strange sound at around 2K when on overun and slow cruising. Car drives ok, no codes etc. best way to describe the sound is it sounds like a pulse noise you can hear it in the exhaust tone. Im thinking it could be a coilpack on the way out as i havent changed them since ive had...

Hi i have a 51 plate cupra, i have had trouble with poor running and misfires. i have had a rac diagnostic on it and it came up with wis fire on all cylinders and running lean. i have replaced all plugs and coil pack but still not right. the fualt codes coming up now are - 17704 - no info...