Thanks for the info. Could this ECT sensor be the problem and do you know how much they run? Also where is this sensor located? Does my car's symptoms sound like anything a bad ECT sensor would cause?

98 Black Mystique LS Duratec V6 2.5L ATX K&N air filter, cleaned EGR, new Autolite double platinum plugs, magnacore wires, rebuit Sonnax valved VB, TSS, TPS. Mobil 1 5W-30