I had a rough idle start over the weekend where the motor was really rocking. I took to my mechanic friend and they found the plug wires to be original (120,000 miles) and the plugs had started fouling out. The rotor button was burnt up. So, he replaced the wires, plugs, dist. cap, and rotor button. The car runs now upon acceleration like a it has never before. It is much smother, but at idle, it is rough. Does anyone know what might be the problem? I have noticed that the tranny seems to shift harder now. Maybe it is because it has more power because one of the plugs was not even firing before. Any suggestions of what to check? I have noticed that there is a slight chatter of what seems to be the lifters. I have had a timing chain job done about 10k ago. Could it be the injectors? If injectors, would I notice the rpms surging? that seems to be smooth.