Idle surge when started, then rpms decrease untill it dies....

[HotSauce GS N/T]

1g 2.0 n/t

Just bought a 1g 2.0 n/t and it runs fine except when the car is started the rpms will jump up to like 3,000 and slowly decease to like 1,000 then if your not on the throttle it will die. Also, when downshifting of in nuetral the rpms will decrease rapidly and will die almost instantaneaously (sp?) I havent checked the isc yet, what else could be to blame?

Also, on a side note the vaccum lines off of the thottle body were messed up when I bought the car, and I am pretty sure I hooked them up right but not positive. I read the diagram under the hood and hooked then up but I by passed the thermo valve and hook the vacuum line right into the egr. Im pretty sure this is not the problem.

What do you guys think??

 

[HotSauce GS N/T]

update: i just checked all the vacuum lines this morning and they are good..still same problem, any ideas???

 

[98autogstspyder]

this is a link i found the other day. My car is having idle surge as well but it doesnt die , it just keeps surging. I havent had an opportunity to try any of these out yet, but i hope it helps you.

http://www.dsm.org/how-tos/tttt/tttt3.html

i think its very useful, let me know what you think.