Not to be a nay sayer but people have tried the POTS mod on the Contour PCM and it causes alot of havoc. The PCM relearns very quickly. It still might work in a racing situation with limited use.
BTW, it would lean things out and add more timing. That's what the PCM does when it's getting really cold air. When its really hot out, it richens things up and pulls a bunch of timing to prevent detonation. That's why your car can be a real dog on 100 degree days.
BP
