My 99 Monte Carlo is having starting issues as well as hesistation issues. I have a 3.8L. The car starts fine when cold but will turn over then die when warm. While i am driving the car will also hesitate when i get on the gas and will sometimes not respond at all. I have had the plugs, plug wires, fuel filter, and MAF changed within the last year so i don't believe that any of those are the issues. My gut is telling me its the fuel pressure regulator....Any ideas???