While driving in the rain, engine acts like a fuel filter is clogged. Dealership says there is none, so that is not the problem. Dealership ran diagnostics and says "no code found". Suggested that problem was ESC being on and wheel slippage during acceleration. Problem persists even after dealership visit and with ESC either on or manually turned off. I suspect that water has splashed on something, causing very bad hesitation while starting from a stop or during any acceleration at low speed.

Once moving and up to speed, it clears up until next acceleration. I intend to pursue this issue with dealership(s) until a solution is found. Any suggestions gratefully accepted.