Ed, From what your describing, I thing you need a all around tune up. Plugs, wires, cap, 02 sensor, so on. Has anyone took the dist cap off and looked inside. Be sure that when ever the 02 sensor is replaced, that you adjust the air flow mixture after the car heats up. Then go for a drive to burn off the rich mixture that may have built up on the 02 sensor. If it gets contaminated, you will have the problems your describing. Call if I can help. John Hervey www.specialTauto.com 800-413-3300.9-5 m-f.