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It also says the description "AC Delco does not manufacture these items anymore. If someone says it's made by AC Delco, they're lying to you. Please don't buy from these idiots."
 

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the ecm does that for you.

i recently threw a high res pulse missing code. my fans turned on, so im pretty sure it went open loop on me (didnt log though).. it certainly did run richer..
 
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