Engine has rough idle and lack power?

I found out it is the automatic choke. Worn parts are causing the choke plate to stay closed if I am not mistaken. A friend did some adjustments and for 2 days I thought my troubles were resolved but the first time I drove it on the hwy at a faster speed it started bucking and surging again exactly like before. I am am sending a photo of the things that aren't working right. First photo is so you can see carburetor and second one is what isn't working properly.

When I went to the parts store and as for an automatic choke the lady handed me a choke thermostat. I don't think that's the problem. The items that I circled in the photo are the items that are not moving when the accelerator is pushed. Those parts allow though choke plate to open and close and when I accelerate. Those parts don't move at all. When I move then manually they just flop around rather loosely and barley open and close the choke plate.

Wow! It is fixed. I went to a local parts store and bought a fuel filter for $2.99 and a friend put it in for me. Took it for a test drive. No more bucking! Thanks for all the help and advice guys. I am so stoked! Brenda M Coquille, Oregon

Can you please tell me where the idle control screw would be located in my 1983 Chev S10 Blazer. Thanks guys! Brenda Merritt

I know that there is a screw missing on a metal plate that's right by the idle adjustment screw, but I don't know what it is for. Here are the photos I have of the carburetor. Let me know if this is what you needed. The small item circled near the idle adjustment screw is where I am pretty sure a small bolt/screw is missing because there is a clip on the metal plate where the hole is to keep the screw from coming out. Hope this helps Thanks, Brenda M