Originally Posted by semtex

*Pedal

I haven't experienced this problem per se, but certainly I've found it easier to drive with proper shoes. Like if I'm wearing shoes with a thick sole, pedal feel is reduced. I haven't that reduced feel translate into a less responsive throttle like you have, but I could see how that might happen. My guess is that the reduced pedal feel is causing you to depress the accelerator either less, or slower, or both. That in turn causes the perception of reduced engine responsiveness. Now, I'm speculating, obviously. There's no way to know for sure without actually having some instrumented readings on your throttle positions when you're wearing different shoes.