Hi, Tom,
RE: throttle actuator, I now kind of suspect that's not your problem, with your low mileage. I haven't actually seen one of these in the flesh but I understand it is on top of the intake manifold, nestled in the "V" of the engine, and because of the location gets cooked over many miles. There is a potentiometer somewhere in the body of the throttle actuator which is the real culprit, but apparently the whole assembly gets replaced to the tune of about $700 for the part and 3-4 hours labor, as I recall (I learned this on the Ritter/Easley list; Stu Ritter has a 400E).

__________________
Steve
'93 400E