Truck: 79 f250 460 engine, 17K orginial miles.

Problem: Bad idle

I think it is the carb on this one, but I can't figure out what part. Only one of the jets on the holly 4 barrel carb is shooting gas (the right side). I checked the jets on it and they are clean. I cleaned out the fuel filter as well. There was some rust/sandy sediment build up on it. Sometimes it idles fine...mostly when you just start it up and it is park/neutral. And then it idles bad and dies when it is warmed up or in drive/reverse. Any ideas guys?

 

spray carb clean down the air bleeds.they are the small brass holes at the top of each barrel.i doesnt take much to plug these off and this is where the idle circuit gets some of it's air.i'd take that squirter off and hose it out too.i've had to run .023 mig wire into
the bleed holes before to push whatever is in there out.