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It works fine for the first 10 km or so, then it'll suddenly stop accelerating, as if I weren't even pressing the pedal, and I have to restart the machine and it'd work again, for at least other 100-500 meters before failing again. It usually happens when I release the clutch to shift gears, or when I stop accelerating and try to accelerate again.

I've already changed the oil, the fuel and oil filters as well as the sparks, the injection system is clean. I've also checked the pedal and it's ok.

What could be causing this?

It's the 2002 German version of the Corsa, it wasn't made here in America.

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Sounds like insufficient fuel pressure. –  Zaid Jun 11 at 10:48
    
I would bet the problem lies with the Idle Air Control (IAC) valve, but that is a gut-check guess. –  Paulster2 Jun 11 at 11:16
    
I've also found some sites that point to the IAC, I haven't heard about the fuel pressure so it's another possibility. I have to double check them. –  arielnmz Jun 11 at 17:57
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