92 3.4 5 speed high idle NEED HELP FAST

[Blackattack]

I have a 92 z34 3.4 5 speed that idels at about 3000 rpm for a while then all of a sudden it will idle up and down. for example it will go up to 3000+ then drop rapidly to 700 rpm and then keep doing it till it decides to stop then it may run fine for little while then do it all over again.it mainly idles 3000+ upon startup.i changed (TPS) and (IAC) dont know what else it could be please if you have any answers im all ears..THANK YOU..

[maxwedge]

LOOK AROUND FOR VACUUM LEAKS, AROUND THE PCV SYSTEM, THRoTTLE BODY, ANY VACUUM HOSE/FIttING, ESPECALLY LARGE ONES, USE CARB CLEANER AROUND THE TB, TO CHECK FOR A LEAK AT THE BASE. CExcuse caps, don't want to retype!)

[Schurkey]

And then start suspecting bad intake gaskets.

[alto]

lumina 3.1 knoking on the motor, how to adjust the balances?

[alto]

Lumina 3.1 the motor is knocking I know the valves are hydraulic, I think the balances need adjustment, can you help me.? Thank you.

[alto]

I need to know how to adjust the balances from the valves, it is making noises, can you help me?

[maxwedge]

alto, balances???? Try and clarify what you mean, there are no valve/rocker adjustments on the 3.1, though.

[Corkscrew]

alto:
1. Don't ask a different question in another thread. Start a new one.
2. Don't make three posts in a row, especially within 4 minutes of each other. Give people time to reply.
3. Spell checker is your friend.

Same with here
http://www.automotiveforums.com/vbul....php?p=3526008

[richtazz]

Ouch Corkscrew, a little harsh, but a good point.