XJ, jumpy speedo, engine dies
 

Hi All,
This seems like a basic problem, but google searches haven't returned
much.

'96 Cherokee, 4.0, Auto. Command Trac.

Speedometer jumps around most of the time when I drive over 50 mph. I
could live with that, but when I floor it, the engine dies. Those times
when the speedo is normal, I have good acceleration. All other systems
are fine.

Appreciate the help, Perry