Quote:
Also verify that the throttle is not being mechanically held open by something preventing it from returning to idle.


Hmm you could have a point. The engine does idle at around 800-900 RPM but I can't close the throttle blades any further than they are now, no travel left in the throttle cable.
Sorry for asking but do you close the throttle blades completely like do they have to be 100% flush with the intake manifold: |_|?