Ok problem is getting worse. My car at idle is bouncing from 400-1100rpms. It seems to be lower than normal and feels like its gonna stall. I changed my plugs and yesterday checked them again to make sure they were gapped have them gapped at .024 they are stock plugs. I am on the fence about going on step colder. I checked for a boost leak and doesn't appear to be any. i boost fine as well. Cars pulls hard and drives great. Just when I in in neutral or at a stop or in traffic it idles super rough and feels like its gonna stall. I have Cams but never idled this rough..

Mod list
Works TB,DP,testpipe, exhaust
269 cams
880 injectors, HKS intake
ETS FMIC, ETS LICP
Running about 26lbs of boost on stock snail..

 

i have the samee problem i been trying to find out for months what the problem is

 

I have been reading and may attribute it to my Throttle body. IDK may do a rebuild the throttle body and Mollykote it to see if that helps.

 

thats what i was thinking to i hear some sort of rushing air at idle coming from/around the throttle body i fixed all vaccum lines, boost leak tested the car/tb seals and still cant find the problem

 

does your car have problems starting in the morning? stalls till it warms up

 

not to many issues on cold start.. sometimes it takes a bit to turn start just turns over a few more times..

when you are cruising on the highway do you hear a whistle?

 

im having a very rough idle on cold start stalling jumpy idle and i smell unburnt fuel, no noise on highway driving

 

Do you have a test pipe? The fuel smell is not abnormal with a test pipe.

 

yes i have a test pipe but on start up is smells like the motor is flooded with fuel i changed my spark plugs the other day they were blackkk and dry, and smelled like gas all of them brand new plugs in there and still running like ****

 

You a step colder? They gaped correct? Stock injectors? Also did you log your AFR's? Might be a tuning issue on your end.

 

yup ngk bpr8es, gapped at .30, 680cc injectors not sure about the tune but the car was tuned from the previous owner, i wish i had a wideband next mod, also ill be getting a retune in the next few weeks when i install my 35r kit..iveytune

 

Oh nice. Might as well wait till you get that done. and dude get a wideband.. Worth the money... Really will help you in the tuning process..

 

to be honest man might have to do with that big of a plug gap, try gappin it down to .028 to see if it helps, more then likely could be plug gap, or one plug gap is off. Good luck

 

thats what i was thinking maybe tighten the gap a little, will a wide gap cause black plugs? also when drive i get no missfires and car pulls hard

 

Gap does seem a bit big. I know on the IX its .022-.024 not sure the gap on the VIII...