i have an 84 gmc 3/4ton...it has a Q-jet with some problems....when im driving it, if you go up a hill or just down a straight and you push the gas to much is "surges" i guess you could call it...i rebuilt it a little while ago and im thinking that the float isnt adjusted right....so that the bowl fills up then you push the gas and it uses whats in the bowl and the float isnt where its supposed to be so its not putting the right amount of gas in the bowl......if anyone knows what would be causing this please let me know