My 98 will idle up and then down until it finally dies. Going down the road it will sputter until you hit the gas hard and then it takes off like a race car. Doesn't do this all the time. The problem seems to be getting worse. It used to do it and then it would stop for about 2 months now it seems like it does it everytime you get into it. Any ideas, i'm thinking maybe fuel pressure regulator. Thanks, Andy