just as the title states...i have my pcm tuned to a afr of 11.3:1 in power enrichment mode and after dropping a new motor in my afr has gone crazy and pegged my wideband. even the normal vehicles o2 sensor is reading lean in power enrichemnt. i just swapped out my high compression na block for a regular supercharded gen 3 block and now im having this problem. what could cause this?