why is my truck stalling everytime i downshift while coming to a stop?

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why is my 2003 dodge dakota stalling everytime i downshift into a lower gear or when i push in the clutch to slow down. i changed plugs,wires,rotor,cap & air idle control. my check engine light is on, my speednometer stopped working,brake light is on,abs light is on & im getting a number 5 cylinder misfire code. i love this truck but this problem is very aggrivating. please help me.