Hi Grumpy
Here is a link to the type of pump I have.
http://www.ppe-pressure-washer-parts.com/product/2300PSI-L. I believe I have the first type of pump you described. The problem is that its not idling. I can manually move the throttle on the carburetor (not the red handle control)to lower the RPM but as soon as I take my finger off it the engine speeds up and eventually the engine will shut down if left long enough about 30 seconds.
Hopefully that's helps you
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