Code P0401!When engine runs and I stop the car wants to move/go and the engine runs with rough idle, misfiring, hesitation , lack of power and sometimes stalling.I did change mass Air flow sensor,Egr vacuum switch,Egr valve,clean the egr tube and hoses.

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2005 Kia Amanti. I had codes P0401,P0174 and P0171. I did change mass Air flow sensor, Egr vacuum switch, Egr valve , clean the egr tube ,put new egr hoses,change Map sensor ,change timing belt,water pump and so on...I change some of that because was time. I need HELP... !!! After I did all that...I did clear the codes . Hard to start /crank...After start ... the car drives the same like when I started the problems. Nothing change. When engine runs and I stop the car wants to move/go and the engine runs with rough idle, misfiring, hesitation , lack of power and sometimes stalling. The code came again but just one , P0401 . Can you tell me how to fix it or what do you think is the problem?Any professional suggestion or answer ? We did try everything...