I've just gotten this problem. Wondering if anyone has any ideas of what it could be from the symptoms.
When I am driving for say 30mins at motorway speed, then slow down at the end of my journey where I'm either stuck in traffic or in a slow speed limit (40kph) the engine feels like it is misfiring but only on part open throttle. Not on closed throttle and not when idling.
When this happens, if I put the foot the floor it chuckles away for a second or two, but once the revs rise it clears up and the engine is back running normally again whilst the revs are up. If I let the revs down again it will chuckle away again.
A short bit of driving with the revs up clears up the problem altogether.
The problem never happens when starting the car up. It only happens after driving for a period of time at above 80kph and then drop down to say 40kph or idling in traffic.
Could this be misfiring? I replaced my spark plugs only a few months ago when it was definitely misfiring, but it was misfiring consistently when I hit high revs at high speed. So previously under normal driving the engine was running fine, but as soon as I floored it and hit high revs it would misfire.
The engine feeling I am getting now at low revs feels like the same feeling when it was misfiring at high revs before i.e. misfiring. Could this be misfiring or something else that just seems like misfiring?
If it is misfiring, could my spark plugs be the culprit again?
I replaced all my coil packs about 3 years ago.
Anyone have any instructions on how to check via vag-com if it is misfiring?