I can't help but want to jump in here and clarify some things. The mixture screw you are talking about is only for the idle circuit. It is what keeps your engine running when your foot is off the gas. The FIRST thing you have to check, is that you don't have the idle speed screw set so high as to be opening the main venturi. If this is the case, the idle mixture screw won't do anything. If your idle speed setting is ok, and the mixture screw DOES affect the RPM, then you do want to set it for max RPM. If it is too high for your liking at this point, set it back down with the IDLE SPEED adjusting screw. If it is cutting out "when you go to get on the gas" that sounds like it could be accellerator pump. With the engine off, you should see a little stream of raw fuel being squirted into the carb if you 're looking into it from above, as you "pump" the gas. This compensates for drop in manifold vacuum as you open the throttle plates (get on the gas). You see, just as you mash on the gas, opening the throttle plates to allow all of the perfectly atomized air/fuel mixture into your motor, you also play a cruel trick on it. You drop the manifold vacuum to NOTHING and without manifold vacuum, the carb is really just a smelly aluminum paperweight. The accelerator pump mechanically helps deliver some much needed fuel to your motor, in it's most urgent time of need. So... check the accellerator pump. If it's working, I seem to recall a way to adjust the plunger travel to possibly increase the amount of fuel squirted and may want to try to get it to squirt more. If it aint squirting, THAT is probably your problem. I apologize for the length of the post. It's just WAY more fun talking carbs than running an automated blood cell analyzer...... :thumbup: