edward_t - good thought about the accelerator pedal not going all the way down but everything passes the on-board diagnosis tests, which includes the accelerator test.

elektrodrive - the optical sensors are working since the directional contacts drop out and pull in at the right times. But i guess it can't hurt to lift the panel and do a quick inspection and cleanup of the eyes.

I think I'll try a driver board. The last F30 I worked on had drive problems and even though the driver board passed all the tests, it turned out to be the source of the problem.