o2, I would think it wouldn't run at all, but it runs fine (now) until positive pressure in the intake manifold.

MAF, possibility for sure.

ignition system is fine, I checked it all out when I replaced the plugs.

I don't knwo about swapping ECUs...yikes. Thanks for the though on the MAF though, I'll have to lok into that...but how the hell do I test it out!?