My car will just quit running, as if someone just turned the key off.

Hello, a vehicle that stalls while driving has an engine performance issue that must be checked into. A major element of performance must be missing when stalling occurs - fuel delivery, ignition spark, air to the intake manifold or exhaust flow - plus engine compression and timing. It's too hard to know what's going on without hands on -- diagnostic tool connected -- testing being performed, especially while symptoms are occurring. The same concern that causes the stalling also likely causes the acceleration and power issue. www.repairpal.com/repair-shops There's a link to find some shops near you to reach out to.