[Ed Wright]

He runs a factory computer which does not make WOT air/fuel corrections unless something makes it "think" it is lean at idle & part throttle. If it sees (or "thinks" it sees lean conditions causing positive fuel trims it will, after a short time, add the same percentage of fuel at WOT it was adding at part throttle. That will, of course , cause over rich conditions racing. If he can run quicker after resetting the computer he has that problem. If so, he can pm me and I will tell him a simple way to cure it with a small jumper. :-)
A quick way to reset it's memory also.