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Something like this was happening to me.
Seemed to happen when I would break while going do a hill, I would just lose all power.
Would restart fine, no codes.

Someone suggested to check the oil level. Topped it off and was fine.
 

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Someone suggested to check the oil level. Topped it off and was fine.
2010, I4 w/177k miles. New plugs, pulled and cleaned throttle body and MAF sensor. Stupidly, I was not monitoring my engine oil level. Coming up to red lights and stopping short would definitely cause my engine to start stumbling like it wanted to stall. Put near 2 qts of oil in, haven't noticed that happening since.
 

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2012 GMC Canyon
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Could be a vacuum leak in the brake booster or a vacuum leak somewhere in the system.
 
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