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So uh yeah the O2 sensor didn't fix the issue... apparently GM's tip line said there could be 4 other potential issues: charcoal canister, o-ring from intake to throttle bosy, MAF sensor, or high pressure fuel pump. they checked the charcoal canister for fuel saturation and checked the o-ring but found nothing. also tested the fuel pressure and found it to be normal so now i get a new MAF sensor this week....
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