been messing with car for couple months now and still cant figure it out. Last yr ran a 14.24 then couple wks later ran again felt like somin gave out and it ran 60.This yr put new rear end in thinkin mayb it was that.Had a 9bolt with 277 gears .got good deal on 10bolt which i had 373 gears for already. Ran a 13.95.Now my problem is it falls on its face comin off line. Hesitates bad dont do it all the time but seems to b getting worse . took out 2wks ago got 3 good runs in then it did it again for next 3 runs.Just got home from track ran 2 runs did it on both.any ideas please not sure if its fuel or dist.mech. pump and hei dist. 650 holly double pumper. im figuring if it ran 14.24s at first it should b down around 13.30 with the diff rear end made.