Car seems to be running extreamily rich and backfires every downshift

gt5.0coyote

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Hey guys just a little background of the car. Full bolt on boss mani auto with 3.73s. The boss manifold was installed for a year and a half and the lund tune was days after. Car ran flawlessly until around 1,000 miles ago. It drinks a ton of gas and is running really rich! It backfires on every single downshift and shoots a flame out occasionally. I read shauns thread a while back about the front o2s not being properly calibrated because the rears are off. Could they be bad?
 

gt5.0coyote

Well-Known Member
Established Member
Joined
Dec 7, 2014
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1,369
Location
Williston fl
I just ended up buying motor craft front o2s and bbk extensions and i will go from there. Installed the driver side then lost daylight so going to do the passenger tomorrow morning. I don’t think it’s tune related since it’s recently been like this. I also checked the exhaust for false knock and it has plenty of clearance.


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