Help with O2 Sensor Issue with Holley HP EFI

[mitch_04]

If a vehicle isn't igniting a cylinder, it will cause a false lean reading. Basically, it sees all the unburnt oxygen and assumes its lean. Since an oxygen sensor doesn't sense fuel, it doesn't realize there is a lot of unburnt fuel as well, it just sniffs all the unburnt oxygen and says "It's lean, add fuel!".

Just another thing to keep in mind, it might something else.