93 chevy truck

I have a 93 chevy truck full size one half ton 4.3 5 speed silverodo. I have a missing like surge when i change gears and mash it all the way to the floor. It seems like it clears up a little when the rpms raise,like maybe its trying to flood or something. I have replaced the plugs,plugwires,distributer cap,rotor button,new inline gas filter,oxygen sensor,new ignition coil, pvc.I had it checked for codes but did'nt show any.I cleaned the egr valve (some carbon in it} and put it back on,it seems to be working ok. I sprayed some carb cleaner down the throttle body, thinking it may have been stoped up but no help.It seems to use a lot moore gas than it should.Any help will be gratefully.THANK YOU ALL. snipped-for-privacy@webtv.net