MY S4 seems to miss at idle not always but now and then any help? and sometimes it idles right down and it needs a little help to get to around 900-1000 idle?

help

also what emission crap can i pull off>? i got no emission laws.

 

If intermittent sounds like cables. After market wires tend to be loose and cause misfire. Also, the idle should be a steady 750 not the 900 - 1K you suggest is ideal. You will get a 3.5 K idle when cold which drops to @ 1.5k within seconds and then to 750 when tuned properly.