HELP! 66 cuda idles fine, but not when in gear

That was a great read. Makes sense and appears(hopefully) my main culprit for a couple issues is vacuum lines hooked up to the complete wrong spots. My brakes don’t have great vacuum either and seeing as it is not on manifold vacuum, that might be the reason. Can’t wait to switch these vacuum lines after work and see the results. Thanks everyone and I’ll update when I’m done!