why does my car surge?

[HSV472]

never had this problem untill i got my diff rebuilt with 4.11s
it surges when your in the final gear and your light on throttle
doesnt do it in any other gears
plz help i have no idea

[HSV472]

any one

[hoots]

when you say surge, is it like missing, or vibrating?

[HSV472]

um say your at 80 it feels like the car is slowing down then speeding up with out revs moving

[centy]

check your fuel pressure.

[delcowizzid]

ide say its the swing of the oxygen sensor my car used to do it bad with minimal throttle on how old is the sensor ever replaced it

[HSV472]

thank but it was replced about a month ago

[burnz]

is the calais internationel I.R.S. ??

loosen the cradle bolts holding the diff, rotate the wheel, retighten the diff to the cradle.

(loosening the bolt and rotating the wheel's will centre the diff in the cradle)

[Bz Kn33z]

I have this problem also but its in all the gers at light throttle or just trying to hold it at 1 speed it will do it, i also changed diff gears to 3.9s but it has only done it since i put the blower back on and the T/B is moved not to sure what it is maybe T/B shutting when the blower does a revolution at slight revs hope this bypass valve fixes it its shitting me off. just have to drive it hard