I have a V6 3.0 1998 Plymouth Grand Voyager that has about 140,000 miles and it kills when we are driving at low RPM's. We were sitting at a stoplight and it killed roughly 30 times in less than a mile. It recently had the valves replaced becasue they were leaking, we thought once that was done it would take care of the problem. I have changed the spark plugs, wires, distributor cap and distributor rotor because there was a crack in the rotor. Does anybody have any ideas on what else might be the cause for it to kill?