setting idle on an 82 5.0

I've been helping my buddy out with his carbed 82 mustang, and I've searched on how to adjust the idle on it, I kinda came out with nothing. So right now, it won't even idle when you let off the gas pedal, it would just die right away, I tried setting the timing with him modulating the pedal.
now there's a solenoid looking thing that the throttle linkage rests on at idle, is that the one I should be adjusting, cuz I tried that and it would run, but when i give it gas, as soon as I let off, It'd die again. a little help here guys, I would appreciate it. Thanks!

I'll post a pic of the solenoid asap
 
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