Originally Posted by demon
Originally Posted by mgoblue9798
Remove and clean the idle air control valve from the back of the throttle body if you haven't done so already.

I have done that twice, and even swapped it with another used one.
But I guess it's possible I have two faulty ones?
When it's out, I can push the plunger in, but it stays in. Not sure if that is normal


Next thing I would do is start spraying some starting fluid around while the engine is idling to look for a vacuum leak.

If that doesn't work it is time to find out if it is spark or fuel causing your problem. I am assuming you don't have any error codes when you do the key dance correct?

BTW when you swap IAC's it can take a bit for the computer to adjust. I just put a used on on my 5.9. It was running at high idle for a couple days even after being plenty warmed up, and finally today decided to act right and went into low idle after warming up.



Last edited by mgoblue9798; 11/12/21 07:55 PM.