I see the engine is fresh, but are you running a used throttle body? If so remove and clean the IACV. You will have to take off the throttle body from the manifold to get to the screws. Use a Dremel with a cut off wheel to cut slots into the screw heads. You'll understand when the throttle body is in your hands. Spray/soak the chambers with carb cleaner or brake cleaner, let it sit for a bit. Then get in there with some Q tips and the smallest flat head screwdriver you have. Turn the wheel until it rotates easily. Once it is as clean as you can get it spray the ends of the shaft with some lube (WD40, PB Blaster what have you) and apply a small dab of grease with a Q tip, rotating the shaft as you do so. Re-assemble and install throttle body. I actually replaced the mangled factory screws with proper bolts should the need to get in there come again.
Hopefully this helps.
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