Need help please..

[Rivera239]

Hello I am sorry if it has been already discussed but I have a 2007 Ford explorer 4.0 v6 with a 2 wheel drive. I am having a issue where I will be driving and out of no where the mph needle start to fluctuate and the truck starts jerking and seems to bogg when trying to accelerate the pedal. It will only catch gear and drive smooth when the speedometer is corrected then will fluctuateand start to jerk agian. I would appreciate any help with this.
I have already changed the speed sensor and it does throw a code p1633 so any extra tips would be greatly appreciated. Thank you

 

[Trainmaster]

As you may already know, the P1633 code says you have a power problem. It likely has nothing to do with a speed sensor. You are losing power. Consider that code and troubleshoot for that. It looks like your power is cutting out.