I have a 1995 Civic Si w/ D16z6 and 5spd. Bone stock all I have is a new AEM cai and new NGK plugs and wires. The car has 200k miles on it right now but until recenlty it ran perfectly, it doesnt burn a drop ofoil, doesnt smokehesitate or have any signs of aging. But just the other day when I started it up in the morning it wouldn't idlecorrectlyit would jump from 1,000 - 1,500 rpms back and forth until it warmed upfully about 5-10 minutes. But now (last night and this morning it didnt stop even when it warmed up).The weirdest thing though is that once ingear or any throttle is engaged theproblemgoes away, performance is exactly the same and even when it is idling goingback and forth it isn't rough it just sounds likeIam actually pushingon thepedal. Any help would be greatly appreciated.

 

There are a lot of causes for Idle Surge, see my post in General Tech Help titled "Idle Surge Issue"

 

Wait... the 95 Si had a D16?

 

yeah, z6

 

Wow, the 95 Si got dicked.

 

Have you replaced the PCV valve recently?