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Re: 6.0 Swap Stumbling Idle
If the exhaust leak is upstream of or not far downstream of the O2 sensor it'll not work well at all. O2 sensors read the amount of oxygen left, as you likely know, and fresh air has a ton, so it'll be all out of whack.
You can't run an O2 sensor in a leaky exhaust. Well you can, but it's useless.
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1970 GMC Sierra Grande Custom Camper - Built, not Bought
1969 Pontiac 2+2 427/390 4-speed Coupe
1969 Pontiac 2+2 427/390 4-speed Convertible
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