Ive had this as well, it happens when i turn the car on sometimes. May do it for a few days in a row then nothing for a few weeks but my engine light has never come on, only the slip and tcs....
Now where im puzzled is that every person seems to tell you a different story! Which aint that great if your gonna pay someone to go searching for it.
Some say coil packs, then others say that wont make any difference. Several sensors 'can't remember them atm' lol could be to blame, but yet still no concrete answer.