My 04 Mach 1 started idling about 1500 RPM and then suddenly droping down to around 800 RPM when ever I stopped. After awhile it started to die when I stopped .
Car is under warranty so I took it to the dealer. They found one of these plates on my car. It was causing the IAC valve to carbon up inside. They replaced the IAC valve, removed the plate and charged me $200. since they said the plate caused the problem.
I just wanted to let everyone know this plate can cause the valve to carbon up inside and affect the idle. Something to check on.
