Hello, new here...

My Beauville has 80,000 miles and is in near perfect shape. I've been spending my time replacing the wear parts and I'm almost done. The last real issue that I have is the choke sticks...

Turn on van, choke on, normal. let it warm up, the flap doesn't open at all. I can flick it down but once I press the gas it's on again. What gives? I've checked and cleaned all the linkage and none of that is at fault. Is it the electric choke heater? Some sensor or gadget I do not know about?

I'm a novice when it comes to carbs, I'd like to not take the easy way out and go FiTech...

Help?