Thanks,

I did do some searches but I didn't find anything that I thought was conclusive. The throttle is a good place to look at but it's idling fine and the hesitation happens in various conditions so I thought the issue might be elsewhere in the fuel system. On the other hand, I could have bad plugs.

I was also curious about something. This is the first car I've owned with an electronic throttle and I've wondered if it's just twitchy compared to a mechanical one. Along those lines I was thinking that one of the potentiometers had a fouled spot or something else that would cause slightly uneven acceleration.