High RPM Problem, assistance please.
I have had a problem for the past several weeks with my 04 GT and I still have not found my solution to my high rpm's. Two weeks ago I had a shop install a new aluminum intake manifold to replace my stock one that had cracked. I had not experienced any idling problems until after the intake manifold had been installed. Since then, I have had the car dyno'd, tuned with a 93 racing tune as well as a 91 street tune, replaced the IAC and TPS and I have a new EGR on the way. I have had my shop recheck all the wiring, tubes, and bolts to be sure everything was put back in the correct position and torque.
The problem is when I start the car, the rpm's shoot up to 2000 RPM and hold there for about 3 seconds, after that they drop back to 1300 RPM until lowering down to the correct 750-850 RPM range at an idle. This occurs even after the engine has been warmed up for several minutes/driving around for a bit. When shifting the RPM's stay around 2000 RPM & will not lower until the car has come to a stop for several seconds. In the lower 3 gears I have no need to apply the gas, as the car seems to do it itself - attempting to reach 2000 RPM. I have an SCT tuner and I have checked out the RPM's and the computer is telling the car to idle and maintain it's correct RPM level (not referring to the 2000 RPM level, but the level that the RPM should be at).
If you have any questions about my problem please ask as I can provide videos and/or more information. If the EGR does not fix this problem, I am planning on replacing the PCV. Any suggestions will help if you have experienced a similar problem. I do not want to take it to the FORD DEALER, but I will if I cannot find a solution by the end of this summer. Here is a picture of the engine bay;
Thank you for your help!