2000 3.4L V-6(Idle Issue)

[geauxldmember]

I recently removed the heads and replaced both head gaskets on my father-in-laws 2000 Grand Am. The engine over-heated and warped a head. I put the engine back together and started up the car with the air breather housing and hoses off. The engine would run at a very high idle and surge. So I installed the Air breather and all associated wiring. Now the car will start, but won't idle. If I am holding the carb slightly open the car will run, but very rough. I can only guess that it has something to do with a vacuum hose or air sensor.

Update: There is one hose that I have not connected. It is a black hose that comes out of the top of the rear valve cover and connects to the top of the air breather hose. Would this affect the idle?

[xeroinfinity]

Welcome to AF and sorry for the delayed reply!!

Yes any vacuum leak will cause high idle. Also starting it with out those items connected can cause the pcm to try and recalibrate its settings to run. So it might take it a few driving cycles to go back to normal.

Also check that the MAF sensor wires arent damaged, this too can make it idle high or not want to stay running.
And lastly make sure the IAC port on the TB is clean and clear passages thru the TB.