Do you know for certain what engine is fitted to this car yet? If it is the GM unit then there are lots of guides on the internet about how to block the EGR off.
Also does the misfire really matter too much? As longs as it is not an indication of more serious issues it is a cheap car.
You need to take in the value of the time taken to research all these issues too. I learnt from my Corsa there is really no point on trying to make an old car new, just fix all the safety related stuff but don't worry about the rest.
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