New best last night....

I went to test & tune last night and ran a new best on my first pass 6.25 & 109.97 with only a 1.40 60 ft. I normally have a 60 ft. around 1.33-1.34. On my next pass it ran another new best 6.21 @ 110.59 with a 1.39 60 ft. and it was sputtering before it got to the finish line. I think I know what the 60 ft. problem is if I can get it fixed. When I mash the gas petal the throttle on the carb slowly opens. I have a new Lokar cable on it I think I need to change to something else. Oh I am running 1/8 mile.