Here's another slightly different chart to visualize the problem (also with new higher resolution data). It shows the relationship of pedal position (x-axis) to ECU-controlled throttle position (y-axis). Sorry for the lack of labelling. I didn't have time to figure out how to add titles and axis labels in the particular version of Excel on the computer I'm at right now.

click for full size


It should be a smooth line/curve such that pressing the pedal more always causes the throttle to open more.

This helps explain the feeling I get in the lower rpm range where pressing the pedal accelerates nicely to a point, then it feels like the engine "bogs down" as I push the pedal more - that's when I get above 25% pedal position and the throttle actually starts CLOSING some as I push the pedal more.