Need help pulling codes!

[Stang_ROTY]

Thanks Chris,

The problem is I'm not getting any codes KOER.

Here's what happens:

I turn the car on, and appx 5 seconds later the check engine light comes on.

I need some advice here in terms of analyzing the problem. If I perform the KOEO test, I got a bunch of codes that make sense (no cats, no cannister purge, etc) but are these codes important? My light doesn't come on when KOEO, it comes on during KOER. SO I should be concerned with the KOER test only?? If so, I can't retrieve codes KOER. I can't get the tester to retrieve signals. I'm watching the MIL indicator and during KOEO, it blinks accndingly. But KOER, it doesn't blink at all. I can tell it trying to do something but I just can't get any codes out of it. I would assume that the memory is keeping it from the statup without headers, but I've reset the CPU many times since then. I dunno here....I'm stumped. I can't get to test 5 KOER basically. I wonder if it's because I'm running a 351 instead of a 302? The step 5 is engine ID after all? Whatcha think?