I just got done with a rebuild on my xj it ran great for about a week! Putting miles on it back and forth to work and I noticed I had an exhaust leak on my manifold so I tightened everything up and now it feel slack on power and when I get to 45 mph it just starts to shake really bad like I got a misfire… any suggestions on what can cause this??

 

Check for vacuum leaks, check your fuel pressure.

 

What year is it?

 

It’s an 88

 

The ground wires at the engine dipstick tube stud. Are they all there, and did you clean the mounting point to bare metal when you hooked them up?

 

Yes they were all cleaned up with a wire brush on the dipstick tube and the block also the connectors