why is my engine not running smoothly?

1997 OPEL VITA
87,880 MILES
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MUGARURA
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my engine was fine until today when i replaced my battery with a new one.
it started well, i drove for about 5km then the engine check came on.on checking,the engine was running irregulary- accelerating and decerelating.
Sep 29, 2011 at 8:02 PM
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RASMATAZ
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https://www.2carpros.com/articles/service-engine-soon-or-check-engine-light-on-or-flashing

Have the computer scanned for code/s-you have a problem within the engine management system that caused the CEL to turn on-This is your starting point of diagnosis,finding out what's going on.
Sep 29, 2011 at 10:07 PM