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Re: 1994 Gmc Sierra MPG ISSUE
Was the previous engine also a 350?
I will pass it on but he did mention that without the O2 the computer is in open loop and that will account for your bad mileage. I don't know how you are going to get around that. Don't take it anywhere where you would have to pass an emission test, it will fail big time.
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Mike
2010 GMC Sierra SLT E. Cab Z71 All Terrain
2009 Cadillac CTS4 3.6L AWD Performance Sedan
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