Installed an 02 police 4.6 in my 72 mustang. It will not go into closed loop. I have codes for the rear O2s that I used a mil eliminator on, but it still gives a code. The rear O2s are not wired in and are not in the exhaust pipes. I also have multiple codes for the evap system which was eliminated when installed in the older car. Could the O2s be the cause or does the computer need to be reprogrammed and who out West would be the best to contact to perform this?