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2009 Sierra won't start
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Question
Soooooo red
Hi guys. My 2009 Sierra 5.3 4wd won't start. Threw p0172 & 175 codes about a week ago. Cleaned maf and couldn't find any intake leaks. Cranks then almost stalls then rpms go up and down till it warms up. Today it started and then stalled and won't start. Any ideas?
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