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Re: P0300
How many miles? Mine did it at 34k and I changed the plugs. While in there I found a vacuum leak off of the plenum. Fixed that. The NGK V POWER plugs that were in it were completely worn down so that there was no longer a v in the firing electrodes. I put NGK Iridium plugs back in. Either plug is reccormended by the Aveo owners manual. When you find what it is would you post us back?
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