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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.

share|improve this question
    
Sounds like insufficient fuel pressure. – Zaid Jun 11 '14 at 10:48
    
I would bet the problem lies with the Idle Air Control (IAC) valve, but that is a gut-check guess. – Pᴀᴜʟsᴛᴇʀ2 Jun 11 '14 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 '14 at 17:57
    
Any updates on this issue? If not, I'd recommend hooking this up to a scan tool to get a better sense of what the car is feeling in terms of fuel trims, sensor readings, etc. – Zaid Dec 14 '15 at 21:18
    
Thank you for your reply. I have since tried with about 5 different people who claim they know how to use a scanner but all of them but one said the scanner didn't find anything, the last one, however, noted that it was receving bad signals from almost all sensors, so he thinks the computer is actually bad. I also asked Scotty Kilmer at his Youtube channel and he also suggested it may be a faulty computer. So I think it may be the issue, wether it can be repaired by "re-flashing" it or it should be replaced I don't know. I would accept your input on this, thank you. – arielnmz Dec 16 '15 at 16:32

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