2000 Oldsmobile Intrique

I don’t know what is wrong with this car, I have put in new titanium plugs, new plug wires, new fuel filter, new air filter, changed the oil, I burn mid-grade gas. The car starts right up when cold, however once it warms up it idles on a non regular number, dies when driving and is very hard to start. I get lousy mileage and it smells like it is either not getting enough gas or not getting enough air. I don’t know what else to do. I had it analyzed with an electric analyzer, no codes were found. When the plugs were put in the air flow sensor had either gas or oil on it. It does not use any oil. HELP Please.