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Let me just start by saying I know a lifted jimmy is not a hot rod.. but I figured tbis would be the best place for help with a chevy 350. My engine seems to run choppy/vibratey. I'm not sure if there is a cylinder that isn't firing or if its the carb. I've had a problem when the carb would act up but we cleaned the carb. Maybe it didn't get adjussted right? It doesn't run bad.. it idles and will rev. It just has some sort of vibration I can't put my finger on
A lifted Jimmy can be a Hot Rod if that's what you want for a Hot Rod!!! Welcome to CHR! You might try pulling the plug wires one at a time with the engine running. If the engine doesn't stumble or at least slow down when you pull a particular wire, that would be the problem cylinder. What is the condition of the rest of the ignition system????
Another real good place to start is with either a leak down check or a compression check!!!
The rest of the ignition system is good. New plugs cap coil and rotor. And soon new wires any help on adjustment of the carb? Its a stock motor and its a quadrajet carb
Do what Dave said about the pulling the plug wires one at a time you may even have two crossed, wondering how many miles are on the 350?