I was answering on what happened to one of the V8's that i installed at 4000 rpm my car would fall on it face,,,but only on the dyno on the street it would go to 5200 then cut out ,, (today to goes to 63000 ) in both places the AFR's were 14 to 17 today they are 11.9 to 12.2 this only happened on one of 4 V8"s we installed. ,,,,wheel sensors are the only thing that i can think of,,, on one of the V8's we moved the sensors to the front wheels, then dyno or burn out all you want.