[rhandwor]

Use a can of carburetor cleaner and spray the sides of the intake. Any place it hits an air leak the engine will smooth out and run properly. What an air leak does is lean out the mixture and they don't idle correctly. Also look at the fuel pressure regulator. If it has a vacuum hose on it pull the hose and if it has gas in it replace.
This is newer than I have experience on and some of newer vehicles are redesigned but intakes leaks still effect them.