weird problem!!

[stlunatics2oo3]

okay my car has this weird problem heres the story :

 

okay i disconnected the battery and i did the idle relearn, and it seems to run fine for a few days like the idle will be like 600- 740 and then it freaks out sometime after it runs good when i start it and it idles like 1000 - 1500 in drive and in park it goes to like 1600 and increases.

 

some my problem is weird to me i am stumped

 

 

 

things i have done and changed:

i had the interenal gaskets checked and none are bad so i am thinkin the problem is electrical

 

 

i have changed plenum and throttle body gaskets

i changed the t.p.s and i.a.c ,

 

i checked the egr valve and it seems to be properly working

 

 

so if you have an idea let me kno

 

brianp and i think its the ecm

 

 

thanks

Jeremy