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It's more likely the O2 sensor causing problems, even though you don't get a CEL. I had a similar problem. My car would randomly cut out a highway speed. Sometimes it wouldn't idle. After going through a distributor and lots of other things, I finally decided to unplug the O2 sensor. When you do this the system stays open loop, and doesn't rely on the O2 sensor for data. When I did this the car ran perfectly, no hesitation or cutting out at highway speeds. After I replaced the O2 sensor the problem was fixed.
A word of caution, watch out for cheap aftermarket O2 sensors, especially on the VX and HX engines. These are wideband O2 sensors and my cheap aftermarket one won't allow me to engage lean burn. As my car tries the motor stumbles until it kicks out of lean burn. Out of lean burn, it runs great. It's simply a quality issue. I bought the cheap $170 one from RockAuto. I would buy the $360 OEM sensor if I could do it again!
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