I am having a hard time dialing in my edelbrock 800 cfm on my 455. I seem to have it set when the car is in park where i can manually rev the throttle and all is well. When I put the car in gear and attempt to give the engine gas the carb feels like it is stumbling out of the gate. When in drive the car is definantly not getting the right F/A ratio. It seems to be not getting the right amount of gas untill the throttle is wide open. I have adjusted the F/A ratio screws and the fast idle linkage a little confused at this point on what to do next any ideas, oh yeah the carb is manual choke.....as always thanks for the help.