What are you doing still up?
Yes you can mess with those and smarter guys than me can take you down that path. If you have a 4-corner idle system, then you can crack the secondaries. Or you can mess with the PCV system. Or I just drill a small hole in each primary butterfly, up between the transfer slot and idle discharge, about 1/3 of the way back to the center. The size of the holes will depend on your cam, and engine size. My 223* cammed 367 liked 5/64. My 230* likes 6/64 , my 292/292/108 found 8/64 a lil much. I had to solder up the holes and start over, with 7/64 . Chamfer the holes on both sides, just enough to remove the burs.
If you make the holes too big, you will have to add fuel,to smooth her out; and then the idle speed will go up, and then you will have to retard the timing. That's all fine but when you get to under 14*, the low speed tip-in response will start to get sluggish. This is more noticeable with engines of less pressure. Mine has a tic under 180, so not a big deal.
