missing after 5 min.

[stng87]

Ok I have just spent all afternoon trying to solve this problem. pulled the plugs and they are a little black and the very tip of the plug not the electrode, the metal part was white. new cap, rotor, wires, ignition module, plugs and gap good, all connections good. It just stumbles most noticably pulling hard at low rpm, and pulling hard at high rpm. Was suspecting the o2's dont want to buy them if they arent bad though. Can a tps effect driving conditions other than idle? What about the throttle air bypass? Thanks