Lately when i be driving the speed limit my car suddenly loses power the after awhile it jump back into gear but once i have to stop or slow down it start to lose power again. what's wrong?

I really need to know what size engine you have in your Beretta as well as how many gears are on the shifter as in low one low two Drive with a circle around it or one two three drive with a circle around it sounds to me like a torque converter pressure switch when vehicle is shifting into overdrive switch is not operating correctly releasing pressure from torque converter causing vehicle not to have enough counterweight for transmission until vehicle slows down and then will operate again shifting through gears until the Overdrive goes to kick in send more info

Is the check engine light on ?

Sudden Loss of Power while driving 65+ on the freeway ' Forums ...

www.teslamotors.com/.../sudden-loss-power-while-driving-...
Tesla Motors Dec 16, 2014 - 31 posts - ‎21 authors
My car is back at the factory getting "worked on"...sudden loss of Power and control while driving on the freeway...has anyone else experienced this? ... My son was driving his '04 Volvo on the highway, when all of the sudden the car started slowing down, despite how much he ... Last I heard they were 60.

Engine Intermittently Loses Power - Avensis Club - Toyota Owner

You could have a engine misfire ,spark plug's or plug wire . Have you changed these parts lately ?

This could be a kick-down servo adjustment.

Refer to the service manual.

Frank
Frank's Friendly Cars Maui Car Rental
www.MauiCarRental.biz

Turn key, on, off, on, off, on & leave it on (not start) & count check engine flashes. 2 digit codes, for example: flash, flash, flash, pause, flash,flash., is code 32

if you don't have a gas cap on the car or if it is on too loosely then that is a possibility. Only other thing I could think of would be water in your fuel. You may try a bottle of "heat" (I think that is how you spell it) at your local auto parts store and chunk it in the gas can. if there were any problems with water that should be the cure.

Michael

have you changed the fuel filter lately a plugged fuel filter will cause this concern
did the power loss start all of a sudden or did you start losing power over time ?

Replace the speed sensor on the trans that will cause exactly what you describe is happening.

Man! Lexus is ****! I have the same problem.