Just an FYI
last 4 months kept getting this code, about once every 100ml, putting me into restricted mode, everything seemed to point to Throttle body ,ECM or Sensor on the T.B (passenger side).
So took a chance and went Cheap $42 and replaced sensor .Have run about 400ml since I installed it and no code Wonder what's next.
Thinking of replacing the Valley hoses, is this a big job, I've had the manifold covers off is it a lot more difficult to access? any tips welcome
Jeremy

 

To some extent it's as big as you want to make it in terms of what you also replace 'while you're in there', e.g. aluminium thermostat tower, octopus, etc. It will take several hours (at my pace anyway) as the inlet manifold has to come off. It's more tedious than difficult.