My 2001 f-150 has a problem that no one can help me with. I can be driving alone about 60 to 70 MPH and all of a sudden thr RPM gaugage gos up to the max and the eng. shuts down but it starts back up and runs great

sounds like transponder has a faulty connection on the back of the dash. give plug connectors a wriggle

no I don't think so , it is only the torque converter clutch engaging and disengaging due to engine load. if you want to test this. go on steady speed over 50 mph no gas pedal movement. touch lightly the brake pedal but not braking and release . during this see the rpm drop down and raise

hope it helps

run fault codes to determine why the CPU placed the engine in limp mode. Check oil and coolant levels.

The first thing I would have replaced would be the fuel filter. An inability to go over 40MPH often means it is not getting enough fuel, and fluctuating RPM at idle is another indicator.

check for problem drive line "U" joints or cv joints

No....the rpms differ from engine to engine and from manufacturer to manufacturer. RPM's are always higher at higher speeds.

peugeot ok
the speedo cable gos to thr seedo drive the front brake caliper bolts onto the front fork leg
hope this helps

If you're only in "D", you should switch to "OD" when driving at higher speeds. "D" only allows you to move up to third gear whereas "OD" will move you into fourth. You're over-working your transmission by driving in "D".

Sounds like it could be a Throttle Position Sensor.

your in limp mode have the vehicle scanned for trouble codes most auto stores offer this service for free --