My car starts to sputter at a certain throttle position regardless of what gear I am in or RPM.. Not sure if it matters, but it is a turbo model. I changed out the fuel filter thinking that might be the problem, but no good. I can acheive highway speeds, but when I get on it, it acts like it is not getting the fuel it needs to accelerate more and starts to sputter. It has done this since I owned it and have put 10K miles on it, and it seems to be getting a little worse now. Any suggestions or ideas would be great! Thanks...

 

How about a Throttle Position Sensor that has an electrical glitch at only one certain point.