Allinkdupp

Figured it out!

beantown617

And?

Hongstertruck

He said in another thread. His problem was resolved by changed out the plugs with Motorcraft ones. His old plugs were Autolites.

kimberly

well found out what has caused this issue . my brake booster was leaking the fluid went back down into my intake , lifters and heads . right now unsure of what else has been damaged as well.

Allinkdupp

Oh bummer, glad you found the problem though

beantown617

I took mine to ford dealer and they said they think its rear axle clutches are worn. I also get a squeek/delay/jump when accelerating at slow speeds or a stop. They're best guess is that its causing the vibrations. Checked ujoints and there isnt any play in them. They quoted $1,100 for the rear differential clutch changeout and fluids etc 😣