Q: power shuts down,but will run and drive very slow

For issues like this you should have the system computer scanned and have any codes diagnosed by a mechanic. The cost to have the problem properly diagnosed far out weighs throwing parts at the problem hoping to fix it. The vehicle is in failure mode and only a test can isolate the failed component. Have a certified technician, like one from YourMechanic, run tests to properly diagnose your loss of power.