Hi, Brian.
You your EGR valve may be stuck open, Try cleaning the top end of your engine with (Top Engine Cleaner), A lot times the carbon and junk with get stuck around your throttle valve IAC motor, Build up on your valves it will stick open the EGR valve and PCV valve. You will a tool engine cleaner Tool. If your handy you can do this yourself. Take some carburetor cleaner spray it on a soft clean cotton rag and clean your throttle plate valve really good get all the carbon and dirt out from around the throttle plate, Warm your car up to operating temp, Hook your tool up to intake manifold vacuum slowly open the cleaner valve, The car with stumble but don't let it stall you have to hold your throttle open just a little bit try to keep it under 1000 rpm. Run all the top engine cleaner through it. Replace your spark plugs and Ignition wires air filter PCV valve, Fuel filter, air filter. And don't forget to change motor oil and filter.
Let us know if this info. Was helpful for you and let us know what fixed it. If you need anymore information contact us and we will get it for you.
Thank you
Joe Terwilliger
Wednesday, January 1st, 2020 AT 7:44 PM