Just had a quick fiddle in the shed, it seems quite weird to me...
If you hold the engine at constant revs (when cold) say 1500 for a few seconds and then let the throttle snap shut, the revs die down, and the engine then gets a little canter (rough running) at this point U can push the accelerator pedal flat to the floor and the engine just idles, a few seconds later the revs start to pick up ever so gradually...
I can re-create the problem time and time again but it seems to be less prevelant when the engine gets closer to operating temp.
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