got my pfc in a few days ago, its working great, the only one thing that i have noticed is that there is a slight stumble from idle when i press the throttle . it drops down and bogs slightly but then picks right up. i changed the fuel cut a bit because i have a light flywheel, so now the only issue is the stumble. any help appreciated. thanks

 

Well i know that when I first put the PFC on it idles funny and does stumble under throttle. Maybe your PFC is still getting used to your car still. I know after a few days it went away.

 

There are adjustments for this, adjust fuel or accel enrichment settings. Suggest you put some sort of AFR meter on it to tell if it's going lean or rich, I suspect lean. You can use the Commander to monitor O2 sensor voltage but a meter is better, nb is fine for this tuning and what I used to get it right.

If this is not it you might need to adjust the TPS, the Mazda manual has a good writeup on it.