Vr6 caddy

Hi and hope help is near... I have a caddy with a vr6 conversation AAA code( don't know much else) It has a real lack of low down throttle response and runs very lumpy until it hits 2.5/3 rpm then takes off like a vr6 should.. I have replaced ht leads and plugs to start looking for a few other maybe's...... Coil? Maf? Coolant sensor?