Originally Posted by IWstangboy03v6
So my car will drop down to 500 rpm sometimes for a couple of seconds. I took the IAC valve off and cleaned it. Also cleaned the throttle body. I put a cold air intake on and I've been changing the vacuum lines out. There are no leaks. Yesterday my check engine light came on. When I was driving home the idle would hang up around 1400 rpm when I was braking. I have a 2003 v6 . Please help
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Get a hold of a CEL reader as soon as you can. Then we'll be able to more easily address the issue, depending on the code.
Have you changed anything else on the car recently? Such as the exhaust or O2 sensors? How long as this symptom been occurring exactly?
Provide us as much info as you can, so we can help you out!