I have a 2007 Ford Windstar with a 4.2l engine. It is making a popping noise in the intake manifold and it will shut down while driving like you turned the key off. I have replaced the air filter, the fuel filter, spark plugs and 1 coil. I have also cleaned the fuel injectors. If it matters, when I unplug the IAAC, it makes no change at idle. HELP, I am my wits end. Thank you in advance.

 

Is the CEL on? what code?

 

It was not on but there was an active code for a # 3 cylinder misfire

 

How many miles on the vehicle Bill?

 

It has 79000 miles on it (sorry for taking so long to reply).

 

You said you changed one coil. I believe it has 1 coil pack with 6 towers for 6 wires. Get all new wires if you haven't yet.
Have you checked for vacuum leaks?
Did you check the IMRC linkage for missing bushings?