I think I ought to sum up what I find wrong......

It wouldn't care if the airbleed screw fell out. It doesn't seem to respond to it at all.
The transition from idle to full throttle stumbles every time unless the throttle is gently advanced.
The engine runs ragged with just about any needle setting except a window of 4-5 clicks that work on the ground. Take the airplane off with that setting and the following describes how it reacts.

The optimum "high speed" needle setting is almost impossible to find. There are about 4 or 5 clicks where the engine will tach 9,200-9,400 rpm. It doesn't seem to care which of those clicks you're in and moving around in them does little to the tach reading. If I click out of those 4-5 on the lean side the engine instantly quits. If I take off on the lean side of those 4-5, the engine will quit in the air. If I take off on the rich side of those 4-5 the engine runs ragged and anyone with experience would say it's too rich. I've landed it and gone one click leaner on the runway, taken right off and seen no change , landed and clicked leaner, still rich, landed and clicked leaner, taken off and engine runs smooth and sometime in that flight gone deadstick. Check the fuel level and it's almost full. Done that a number of times.

I'm not running with the cowl on the airplane. It hasn't been on yet.