Post by
nissanfreak12 »
https://forums.nicoclub.com/nissanfreak12-u177688.html
Sat Feb 04, 2017 8:07 am
Those pipes are basically for intake baffles, it is used to quiet down the "foghorn" sound it actually makes. Those can be deleted with no ill effect, but you need to block off the part of the hard intake pipe that goes under the headlight, otherwise you have a large intake leak, unmetered air entering the engine which will cause the engine to idle bad or die. You can get a rubber cap at home depot, I think 1 1/2" size, I have done it with all my z's. Most people delete them because they are an easy way for an intake leak to happen.
Your issue is probably an intake leak or vacuum leak