Here's the link to my thread:
HELP! Severe acceleration lag - I am just about to write up a detailed follow up so check in an hour from now.
Sounds like what i experienced twice so far and i think thompsontechs is on the right track. But several members on this forum have reported similar symptoms but different solutions. The other more common solution is replacing all camshaft position sensors and the crank angle sensor. The least satisfying solution seems to be replacing the throttle bodies (problem re-emerges shortly after, because throttle bodies were replaced as a stab in the dark solution by dealers).