Q: Will not stay running.

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My problem is my Impala was running fine until one day I was driving and I lost all power (the car stalled). I let it set for about an hour then turned it back on and the check engine light went off and I continued to drive it. The other day (about a week later) the car started stalling on me so I had a local mechanic check it out, He gave me the codes that came up on the O2B computer but couldn't find a physical problem with it. So I went online to fine possible issues with the car and found a lot of times its either or both the MAF sensor or it is the throttle body, The car had a very ruff idle to it. After cleaning the throttle body the car ran great for about ten min then stalled. Now the check engine light is on and will not go off and the car will not stay running for more then five seconds. I thought it could be something to do with a sensor or the FPR but I am not sure. (I do have the codes if needed) Thank you

My car has 186000 miles.
My car has an automatic transmission.

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