[Rev]

My car did that same thing some years ago. It wouldn't run more than 50 mph on the freeway without fuel starvation and cutting out.Then it would be OK under 50. It was because of that flexible line connection to the gas tank that was kinked. Twenty minutes after the peoblem was identified, everything was fixed and the car ran as strong as ever.

Sounds like a fairly common problem in these cars.

Rev