2004 Buick Lesabre emissions test

2004 Buick LeSabre 3800 mileage: 14,000. I have tried to get this car to pass the emissions test. There are no fault codes, car runs well except for a loping idle and sometimes a spit and die at idle. HC and CO are way out of range. O2 reads.8v at idle. Exhaust smells very rich. I have replaced the ECT and TP sensors, plugs, wires and filters. Fuel pressure is 40 psi. I need voltage specs forthe TP and MAF sensors.