jgraemec

2014 Fabia TSI 94,000 miles. Few weeks ago came out from work and engine mgmt light went on. No issue for good nr of miles but then misfire started accelerating / hills. Then misfiring on idle quite badly so got it to garage. They borescoped / pressure tested and reckoned some carbon cylinder 4 pressure 80 so said valve job - £2k estimate. Drove it home to ponder - all misfire gone! - for 3 weeks. Interwebs thinks got lucky and bit of carbon causing loose valve seal dislodged. This time much less misfire - but there in 3/4 esp with hill but no idle misfire. Driving and this time ESC / ESP / TMPS lights - with bigger judder - but these clear with engine switch on / off and smooth drive except accelerating 3/4 gear. Have booked in for review. Garage think because under load its the valve. Interwebs thinks this time more likely ignition related - spark plug cables, spark plug, coil pack, maybe dirty throttle or sensor fault. Thoughts appreciated!