Hey guys just a little background I just sold my 96 Gsr and picked up a 97 civic cx with 270k km. will post pictures shortly.

Needs some basic stuff, tie rod and brakes. I noticed a RPM drop once I start driving the car. The RPM's will drop around 500rpm when I push in the clutch coming to a stop. It starts and idles okay I'm only noticing this once the car is moving. Does anybody know a good place to start diagnosing?

It doesn't seem to do this all of the time.

 

Stock 97 civic? CEL codes?

Try cleaning the IACV.

 

mine does the same thing when its warmed up good just cleaned my idle air valve yesterday and still does it but might help

 

Bone stock. CEL not showing. Tryed to hook up a scanner and it wasn't able to establish a connection. It loaded for about 30 seconds then failed.

I will try that. Thanks.