rock steady idle just by installing tweecer?

i installed my tweecer and i have a rock steady idle (so far anyways) It idles just like stock and i haven't even messed with any settings yet. now if i take the tweecer off my idle fluctuates again. did this happen with anyone else? and if so, what would cause this? not that i'm complaining I'm just trying to learn whats going on in my computer.

thanks,
scott

I have the J4J1 on #1 and the stock tune on all the rest right now. when i turn it to the off position and give it a little rev it will start fluctuating and almost stall. when i give it a little rev in the #2 (stock bin file) it barely flucuates but still does it a little. And with the #1 postition(cobra bin) it is rock solid and idles smooth with no fluctuation at all at about 700rpm(i set the idle to 600 with the tweecer but the needle sits at about 700).


I haven't taken it out of the driveway and driven it yet so time will tell how it does once i get it on the street but right now its looking pretty promising.

My car never even idled this good with the custom chip i had tuned on the dyno. I'll have to wait for a cold day and see how it does then but so far so good!