i replaced my header last night and now my idle is real high. just wondering how many miles it took for the computer to readjust to me unhooking the battery and all the plugs and sensors. normal idle is right at or just below 1krpm. its pushing 1500 to 2k and even 3k when i first fire it up. ideas?

 

heres the new header!

 

I'm not sure if thats causing the trouble, however I read somewhere that it is not so much the miles, as rather the nr of startups for the ECU to 'learn'.
Did you check of all the sensors are reconnected properly? And besides running high idle, any other symptoms? How does it run while driving?

 

All sensors are connected. No other symptoms besides too high of an idle.

 

Renix instantly, newer types up to 8 hours disconnected.

But you have a common problem. Easy to fix.

When you put on the header one of the manifolds didn't seat right - probably hung up on the dowel pin.

Now extra air gets in, O2 SENSOR tells the computer it's lean, computer adds more fuel. Net result idles too fast.

Do a smoke test to prove it - blow smoke in an intake port - fix where it comes out.

 

+1 on the smoke test. Since you removed the intake manifold a vacuum leak due to a bad fitting or damaged hose is a candidate. It is also possible that a bolt isn't as tight as you thought it was - check those ones near the back of the head.

It may also be a coincidence - might want to check your TPS and IAC.

 

Very common for the header to interfere with #6 intake runner. Some filing is usually needed. If you use certain kinds of smoke, you won't care if it's fixed. Just want a Hershey bar. Cigars are recommended.