ORIGINAL: Sport_Pilot
Removed the 'T' system and tried leaning out the mixture valve. Now idle mix is very lean, high end is pretty leaned out, and although transition is good the engine loads up with excess fuel if you have the stick anywhere in the middle of the throttle range (aka flying the plane). However no dead sticks.
This is indicitive or too much pump pressure, adjust the pressure down till mid range is not so rich. You will have to richen up the high and low needles after adjusting.
I have the screw on the pump out as far as I can without it being in danger of falling out. Adjusting the screw on the pump doesn't seem to change anything.