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i cant pull up a p0020 for a cobalt, if it was a p0011(intake) or p0014(exh) i would try sticking a solenoid in
on the maf, assuming you have a stock intake, its hard to see if the intake tube is actually all the way on the throttle body, so its worth checking. other than air leaks, simillar to what okxxfe was saying, i'd be suspect of a broken wire inside the insulation near the maf connector
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