So I have long had the P2004 code on my 2004 ford mustang V6 and today is the day I have time to take off the upper intake manifold to take a look at the IMRC and I was wandering if anyone had a guide or tips to help me out? I heard that I should also check the arms because apparently a lot of early 2000 Mustangs have had the same problem and a lot of the times it could be the arms connecting to IMRC to the set of valves that won't close. For those of you who don't know the code it says that my valve is stuck open.