I was doing 50 mph and it felt like the truck was jerking. Almost like it froze up a second but then broke free. Then getting onto the highway it did it again, but i was accelerating so it felt like I had resistance.

It's a 2005 F150 5.4. With 8" lift, 35" toyo mt, CAI, exhaust, edge evo programmer ( no custom tune)

 

Caliper sticking?

 

I don't believe so like 3 weeks ago the dealership checked my brakes and stuff, unless they messed something up. They resurfaced my rotors and replaced pads in the rear. Also wouldn't I smell my pads burning up?

 

Its hard to diagnose over the internet, but mine did a wierd jerking/vibrating at 50mph when it needed the plugs changed. I did a tune up and haven't had a problem since.

 

Most likely a plug issue.

 

Well I'm at 123k and its on my to do list to change them out. So ill try to go in tomorrow and get that taken care of.

 

Mine felt like that when I needed a plug change as well. Right around 50 m/h and low RPM. I also changed FPDM at the same time so not sure which fixed it but you are definitely due.

 

Ya I took care of my fpdm last month after it cracked and I broke down on the road cause water got in it lol.

 

Just made the apt for tomorrow. Hopefully it goes smooth.

 

Interesting thread "topic" by the way.