Q: Power/Engine isues

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I have a 2004 Subaru Forster and I was driving it on the freeway today when it started losing power, I would press on the gas and it would shake and go slower and slower until it lost all power. I turned it off then back on and it started working but would only let me go up to 40 mph, I got off the freeway and then it lost power again. This time I had to turn it off and on like five times until it started working again. Luckily I was close to my work so I made it, but Idk how I'll make it home. Do you have an idea of what the issue could be?

My car has 146000 miles.
My car has an automatic transmission.

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