Well, after a little reading on NASIOC, I think I may have found an explination for my misfire CELs.
The way the stock ECU determines if there's a misfire is by comparing crank and cam position signals. Since the Unichip intercepts and modifies the crank position signal, sometimes the ECU incorrectly thinks there's a misfire. That would explain my misfire codes on all 4 cylinders w/o actually hearing or feeling the car misfire.
Or perhaps the car is really misfiring, and I just don't notice it? I know I get some exhaust burps when I'm hard on the throttle and jump off the gas... but that's pretty normal, and it's not coinciding with the CELs, so I don't think that's a misfire occuring. I also notice some hesitation when I'm on the throttle around 3500 to 4000 rpms, but that's just good ol' Unichip tuning for ya...
The CELs always occur at about 5000 rmps when I'm accelerating hard, and the car usually feels fine at those rpms.
Hopefully, all I'm seeing is another side effect of the Unichip's poor method of tuning. I'm telling you, it's all about AccessECU or ECUTek! Too bad they're illegal in STX.
I guess next season, I'm just gonna have to bite the bullet, get some coilovers, some r-compounds, ECUTek, and mix it up with the big boys in SM. (You hear that Dean!!! Next season, you're mine!!
Or maybe I'll just come in second to you.
)