Hello all,

I have a 97 f150, 4.6, 5spd,4x4, approx 130k miles, scan gauge. I was towing a small utility trailer yesterday and noticed that the truck was alternating between open and closed loop at 65 mph. Generally, this was happening as I went up a hill or accelerating. About 10 seconds in each status for several minutes.

It wasn't doing this if I stayed at 60 mph.

Any thoughts or suggestions welcome.

Thanks

ihilani