Its very easy. Have a good factory cat converter on and simply change the timing to 12-13 degrees and the a/f to 15.2:1 in the cells that being used during light cruise. Adjust the v/e table so the desired a/f can be achieved. Be sure the engine and cat converter are hot. Request that the car not be shut off while they get ready to test it. Keeping it hot is very important. Otto J's advise worked with no problems at all. Then switch back to your real program:smile: