ERATIC IDLE HELPP :) help help help

[300ZXttZMAN]

OK everyone i have a 90 300zx tt 5spd its a true twin turbo (not a swap) it has 107k actual miles.

when the car warms up it idles at about 770 rpm and if its fully warmed up (at normal opperating temp) and i press the gas it some times hesitates and it will flucuate for like 500rpm up and down anyone ever heard of this... any suggestions

so if i rev it to 2000rpm it will go to 2500rpm and then to 1500rpm then back up to 2500rpm then sometimes it goes down to like 1000rpm once it went to 500rpm... PLEASE HELP


I have an exaust leak would that make it do that???

Thanks in advance

[jona300zx]

hmmm it might be a vacuum leak.... check your hoses and see if any are torn or leaking

[300ZXttZMAN]

yea i did that i sprayed them none where leaking... what you think..
thanks for your reply jona :0

[300ZXttZMAN]

what else do you suggest

[300ZXttZMAN]

can anyone suggest anything

[es.biggs]

You probably need the correct spark plugs, Throttle Position Sensor could be out of adjustment, IACV may need cleaning

It could be a million things. And there are a bunch of people that have had this problem...do some research, the information is out there

[300ZXttZMAN]

ha ok i have changed the origanal plugs ngk... how do i adjust the tps tho ???

[300ZXttZMAN]

i mean i have changed the plugs back to the plugs it comes from the factory with the wierd thing is that it idles bad once its warmed up

[GerryO]

http://www.pexcom.com.au/z32cms/e107_pl ... ontent.335

[300ZXttZMAN]

thats good help i like that site
thanks so much

[es.biggs]

That is a great link GerryO - thanks!