rough idle

[1991mikey300zx]

Hi, never really posted on here just browsed but i got a question? my 1991 300zx tt has a rough idle where it will bounce from 1000 to about 700 rpms. is there something i could adjust? and also a while back it started vacuuming around 14-16 psi where it used to say at 19-20ish? ive tried many things and nothing has seemed to work. what do you think boost leak? possibly exhaust leak?

[300ZXttZMAN]

i have the same problem but i doo have an exhaust leak... Will an exhaust leak make idle eraticate

[1991mikey300zx]

im not sure im thinkin that because my buddy owns a rod shop and we made up some screamer pipes and it started after that. so imma get some speciality z downpipes and see if that does it...

[CrazedZ32Owner]

Well not to be a d*ck about it but if it started happening after you did your "exaust" im guessing you guys screwed up somewhere..... can't go wrong with greddy or HKS

[1991mikey300zx]

yeah we was just trying something different. imma change to different down pipes whenever i replace my flywheel again.