Hello all

[Montync]

I am new to the forums and this is my first post, so bear with me and guide me where I need to go. I have a 1986 C10 with a modified 305, from what I know it has
601 heads
I Think .204/.214-.420/.443 cam 112 lobe SA
performer intake
stock Edelbrock 1406 electric choke.
I have searched all over with no luck. The issue I am having is today out of the blue, I feel like I am getting a miss on one cylinder only at idle. All plugs are firing,tested for vacuum leaks, Nada! Here is the kicker I turn the the idle mixture screw on the Right, engine stalls(Normal)...
Turn the one on the Left, and the idle increases when turned clockwise, decreases and stalls counter clockwise.

I am leaning towards a blocked idle mixture bleed tube/circuit (as it is the next cheapest thing to check but need shop air to blast it clean)

Thanks, Look forward to many more head scratching moments with yall....