Haynes workshop manuals are always a good place to start if you don't know much about your car. amazon is your best bet. did the diagnostic check show any fault codes. the problem could be a few things, badly set plug gaps, egr valve getting blocked, insulation on the coilpack to sparkplug braking down, dirty air filter etc etc. join a Vauxhall corsa forum as the members can be a mine of info. hope this is of some help.
xs11
April 2015
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