104 engine surging
 

Hello Folks
The CE light came on, dealer diagnosed EGR valve. I checked it out and there was a broken vacuum line to that vac switch in the front of the engine. I replaced it and removed the EGR, cleaned, tested, and reinstalled it. I also changed my oil.
The engine now when you come to a stop goes from 475-600 RPM back and forth, it continues to do this until you put the trans in neutral. It then begins to idle normally. I have checked everything to ensure all is ok. Could this be my idle control valve? Any help would be appreciated.
Brian

What year and model is your car?

Assuming this is a post 93 M104 clean the throttle body/EA and see what it does.



Joe

Found it!
 

Hey folks,
I checked all the vacuum lines again and while I was changing my oil I must have knocked a line off, I put it back on and it is smooth as silk! I am happy again! my car runs like it should! Thanks for your help!
Regards,
Brian