1996 Saturn SL1

Are u sure u have a rough idle and not just a excessive vibration at idle saturns get whats called a collasped upper motor mount causing a bad vibration that can be mistaken I have had alot of customers come in and say they have a rough idle and it was just a bad mount. Iam just try to make sure were not chasing our tails here thinking it a rough idle when its a simple fix like a mount. So does the engine rock back and fourth at idle can u see the rpms bouncing around on the tach or does it just vibrate alot at idle?
Louie

Let's back up here sounds like we have replaced alot stuff let's start by why u replaced each item? I can suggest things for u to replace but that's not a good way to fix something like ur egr if it were sticking it would set a code u said u don't have any codes. Also what are the symptoms I was asking u that in my post to u can u see the rpms on the tach move at idle does the enging rock at idle or does it just vibrate at idle?Also how did u check ur mounts does it miss in gear out gear or both in gear and out of gear at idle?How does it run when ur driving down the road smooth plenty of power lack of power does it miss while driving down the road?Have u checked for a vaccuum leak?I would start by checking ur pcv hose the s shaped hose from ur cam cover to ur intake the they become soft and colaspe and cause all kinds of problems they even get a hole in them causing rough idles high idles. Have u checked to make sure ur battery cables are clean and tight that could cause strange idles. Have u looked at the spark plugs yet another source of strange idles. Let me know the answers and what u find.
Louie