Biohazard

Current problem - for which I am seeking the collective FABO assistance.

Idles like a pro. Once warmed up, it will not accept any throttle no matter how slowly I bring it on. Acts like too much air or not enough fuel. I have moved the idle mix screws all over the place and fiddled around with the accelerator pump positions. Same result. Once the choke valve is fully opened, you simply can't give it any gas.

Video ---

[ame=http://img.photobucket.com/albums/v467/vr6pilot/Red%20Fish/3EEAC95A-68D7-4DC5-A5AF-24C063EB085B_zps5uwvoccn.mp4][/ame]

However, if I hold the choke valve closed about 25-30 degrees, I can rev it up and make it sing. I can even do throttle blips and she will stay running.

So my question is a simple one: WTF?