My girlfriend has a 98 Neon with a SOHC motor with about 140K on it.  The
car was not well maintained prior to her purchasing it from what i can tell.
Needless to say with this much mileage on it, we are now getting to the
point that the lack of proper maintenance is now becoming evident.

The car shows typical symptoms of rough idle, stumbling, stalling out,
etc...  After reading the puter at AutoZone, it was diagnosed as having
problems with the front oxygen sensor and the EGR system.  While the front
oxygen sensor is simple enough, i pulled the vacuum line between the
"Electrical EGR Transducer" and the EGR valve and the car ran fine.
According to the Haynes repair manual that i have, this tells me that the
EGR valve is working, but something else isn't.  Unfortunately, the Haynes
manual doesn't tell me how to diagnose exactly what the problem is.  My
guess is that it is what Haynes refers to as the "Electrical EGR
Transducer", but i'm not certain.  I know that this transducer feeds the
PCM, which also relies on other sensors.

Does anyone know of a good source of info on how to make certain that the
EET is the problem?  I had already purchased an EGR valve prior to finding a
manual for the car, so i don't want to end up chasing my tail or buying
anymore unnecessary parts.  Any and all help appreciated.   Sean