318 Motor, please help

1...Do you know general condition of engine, does it burn oil, have you run compression/ leakdown check?

2....Where is the timing set, and do you know how to check accuracy of timing marks with piston stop?

3...Do you understand and know how to adjust carb idle mixture, aka, retarded timing and or lean idle mixture will tend to amplify what you describe

3...Do you understand what the carb accelerator pump is and what it does, and have you checked that?