attached is the data log from the most recent testing on my 7727 ecm equipped, TPI based small block mopar. I'm baffled. according to the sensor data, I'm running dead lean. according to plug reading and my nose, its incredibly rich. plugs are black and sooty after just a little run time, hard to start without opening the throttle considerably, and rich enough to make my eyes water.


I have no dead cylenders, and no observed leaks upstream of the oxygen sensor (heated 4 wire, bosch, located in drivers side long tube header collector.


so what am I missing? is it tuning, or mechanical? what should I check next?

I'm running AXCN $8d.