Re: 2003 P71 with stumble/shudder
jwko- thanks! i appreciate that, i hadn't found that info yet. it seems my fuel pressure is on the low side at 28-32psi compared to 35-45psi. i've been told that my problem is transmission related, on a 100k mile car that is a possibility. but, more and more i'm thinking it is a fuel delivery problem, or ignition. as i mentioned, changing out the throttle position sensor made a big improvment. that is the problem with modern cars, there are so many sensors, that they mask the simplicity of the old days when either your problems were, fuel, spark, or transmission.
and, i did go to autozone, they are not able to read any codes that don't throw the c.e.l., it was worth a try though.
thanks for all replies!